Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.10.0.1
Debt (Details)
€ in Thousands, ¥ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 96 Months Ended
Sep. 07, 2018
USD ($)
Sep. 01, 2017
USD ($)
Sep. 01, 2017
JPY (¥)
Apr. 28, 2017
USD ($)
Jul. 31, 2017
EUR (€)
Jul. 31, 2017
USD ($)
Jan. 31, 2017
EUR (€)
Jan. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Rate
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Rate
Feb. 01, 2025
EUR (€)
Feb. 01, 2025
USD ($)
Mar. 31, 2018
USD ($)
Jul. 01, 2017
EUR (€)
Jul. 01, 2017
USD ($)
May 02, 2016
USD ($)
May 05, 2010
Debt                                      
Long-term Debt                 $ 316,637,000   $ 316,637,000       $ 324,623,000        
Debt, Long-term and Short-term, Combined Amount [Abstract]                                      
Revolving line of credit                 0   0                
Current maturities                 (20,553,000)   (20,553,000)       (20,540,000)        
Total long-term debt                 296,084,000   296,084,000       304,083,000        
Interest expense                                      
Contractual interest expense                 6,896,000 $ 6,657,000 13,741,000 $ 17,082,000              
Capitalized interest                 (56,000) (31,000) (120,000) (39,000)              
Amortization of debt issuance costs                 93,000 145,000 209,000 312,000              
Amortization of debt (premium) discount                 299,000 490,000 397,000 756,000              
Imputed interest on acquisition-related obligations                 14,000 29,000 29,000 56,000              
Interest expense on capital lease                 41,000 75,000 67,000 158,000              
Total interest expense                 7,287,000 $ 7,365,000 14,323,000 $ 18,325,000              
Long-term Debt, Unclassified [Abstract]                                      
Second part of loan         € 300 $ 300,000                          
Advanced Payment from Original Equipment Manufacturer [Member]                                      
Debt                                      
Long-term Debt                 440,000   440,000       0        
Debt Issuance Costs, Net                 100,000   100,000                
Long-term Debt, Unclassified [Abstract]                                      
Proceeds from Issuance of Debt $ 500,000                                    
Debt Instrument, Unamortized Discount $ (100,000)                                    
Advanced Payment from Original Equipment Manufacturer [Member] | Line of Credit [Member]                                      
Debt                                      
Line of Credit Facility, Maximum Borrowing Capacity                 36,000,000   36,000,000                
Term Loan Credit Agreement [Member]                                      
Debt                                      
Long-term Debt                 310,645,000   310,645,000       318,782,000        
Debt Issuance Costs, Net                 12,800,000   12,800,000       13,300,000        
Long-term Debt, Unclassified [Abstract]                                      
Interest payable                 100,000   100,000       200,000        
10.5% Senior Notes, net [Member]                                      
Line of Credit Facility [Abstract]                                      
Rate                                     10.50%
Revolving Credit Facility [Member]                                      
Line of Credit Facility [Abstract]                                      
Current borrowing capacity                                   $ 75,000,000  
Remaining borrowing capacity                 75,000,000   75,000,000                
Other Debt Obligations [Member]                                      
Debt                                      
Long-term Debt                 5,552,000   5,552,000       5,841,000        
Long-term Debt, Unclassified [Abstract]                                      
Proceeds from Issuance of Debt             € 2,200 $ 2,500,000                      
Debt Instrument, Unamortized Discount                 $ (400,000)   $ (400,000)       $ (500,000) € (600) $ (700,000)    
Term Loan Credit Agreement [Member] | Line of Credit [Member]                                      
Debt                                      
Line of Credit Facility, Periodic Payment       $ 4,300,000                              
Line of Credit, Debt Issue Discount Percent       3.00%                              
Line of Credit Facility, Maximum Borrowing Capacity       $ 345,000,000                              
Line of Credit Facility, Maximum Borrowing Capacity, Incremental Increase       $ 50,000,000                              
Debt Instrument, Redemption Price, Percentage       97.00%                              
Line of Credit, Covenant Compliance, Pledged Percent of Outstanding Voting Stock       65.00%                              
Line of Credit Facility, Periodic Payment, Percent       1.25%                              
Line of Credit Facility [Abstract]                                      
Rate       0.97%                              
Term Loan Credit Agreement [Member] | Line of Credit [Member] | Base Rate [Member]                                      
Line of Credit Facility [Abstract]                                      
Basis spread on variable rate       5.00%                              
Term Loan Credit Agreement [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]                                      
Line of Credit Facility [Abstract]                                      
Basis spread on variable rate       6.00%                              
Minimum [Member] | Term Loan Credit Agreement [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]                                      
Line of Credit Facility [Abstract]                                      
Basis spread on variable rate       1.00%                              
Scenario, Forecast [Member] | Other Debt Obligations [Member]                                      
Long-term Debt, Unclassified [Abstract]                                      
Long-term Debt, Maturities, Repayment Terms                         P8Y P8Y          
TOKIN [Member] | Other Debt Obligations [Member]                                      
Debt                                      
Line of Credit, Debt Issue Discount Percent | Rate                   0.04%   0.04%              
Long-term Debt, Unclassified [Abstract]                                      
Proceeds from Issuance of Debt   $ 3,200,000 ¥ 350.0                                
Initial Repayment [Member] [Member] | Scenario, Forecast [Member] | Other Debt Obligations [Member]                                      
Long-term Debt, Unclassified [Abstract]                                      
Repayments of Other Debt                         € 200 $ 200,000          
Remaining Repayment [Member] | Scenario, Forecast [Member] | Other Debt Obligations [Member]                                      
Long-term Debt, Unclassified [Abstract]                                      
Repayments of Other Debt                         € 210 $ 248,000