Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Details)

v3.10.0.1
Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization $ (24,090)   $ (24,090)   $ (22,598)
Intangible Assets, Net (Including Goodwill) 55,457   55,457   59,907
Finite-Lived Intangible Assets, Net 40,488   40,488   44,433
Finite-Lived Intangible Assets, Gross 64,578   64,578   67,031
Intangible Assets, Gross (Excluding Goodwill) 79,547   79,547   82,505
Indefinite-Lived Trademarks 14,969   14,969   15,474
Intangible Assets, Net (Excluding Goodwill) 55,457   55,457   59,907
Goodwill 40,294   40,294   $ 40,294
Amortization of Intangible Assets 1,100 $ 1,400 2,300 $ 2,300  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 4,500   4,500    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 17,800   $ 17,800    
Purchased Technology Customer Relationships And Patents [Member] | Weighted Average [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Asset, Useful Life     15 years 9 months 12 days   15 years 9 months 12 days
Patents [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization (11,335)   $ (11,335)   $ (10,625)
Finite-Lived Intangible Assets, Net 15,327   15,327   16,037
Finite-Lived Patents, Gross 26,662   26,662   26,662
Amortization of Intangible Assets 400 300 700 700  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 8,200   8,200    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1,400   1,400    
Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization (12,531)   (12,531)   (11,735)
Finite-Lived Intangible Assets, Net 25,161   25,161   28,396
Finite-Lived Customer Relationships, Gross 37,692   37,692   $ 40,131
Amortization of Intangible Assets 800 $ 1,100 $ 1,600 $ 1,600  
Finite-Lived Intangible Asset, Useful Life     12 years 3 months 12 days   12 years 3 months 12 days
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 9,600   $ 9,600    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,100   3,100    
Other Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization (224)   (224)   $ (238)
Finite-Lived Intangible Assets, Net 0   0   0
Other Finite-Lived Intangible Assets, Gross 224   224   238
Trademarks [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible Assets, Net (Excluding Goodwill) $ 14,969   $ 14,969   $ 15,474