Annual report pursuant to Section 13 and 15(d)

Segment and Geographic Information - Net Sales by Country (Details)

v3.20.1
Segment and Geographic Information - Net Sales by Country (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales $ 293,174 $ 294,741 $ 327,397 $ 345,242 $ 355,794 $ 350,175 $ 349,233 $ 327,616 $ 1,260,554 $ 1,382,818 $ 1,200,181
Property, plant, and equipment, net 552,636       495,280       552,636 495,280  
Solid Capacitors                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 886,063 935,838 771,240
Film and Electrolytic                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 $ 175,803 $ 206,240 $ 201,977
Net sales | Sales risk                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Number of customers                 1 1 1
Concentration Risk, Geographic                 0 0 0
Net sales                 $ 154,600 $ 184,300 $ 133,500
Net sales | Geographic risk                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Threshold for Disclosure Percentage                 3.00% 3.00% 3.00%
Property, Plant and Equipment | Geographic risk                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Threshold for Disclosure Percentage                 1.00%    
United States                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 $ 246,821 $ 292,980 $ 233,133
Property, plant, and equipment, net 68,992       57,095       68,992 57,095  
Japan                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 157,539 178,502 170,282
Property, plant, and equipment, net 89,080       89,602       89,080 89,602  
THAILAND                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Property, plant, and equipment, net 82,905       82,389       82,905 82,389  
China                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 181,319 173,148 163,016
Property, plant, and equipment, net 51,120       45,815       51,120 45,815  
Italy                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 12,031 15,551 17,905
Property, plant, and equipment, net 25,373       35,197       25,373 35,197  
Hungary                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 12,050 12,245 13,254
Mexico                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 49,346 44,267 23,915
Property, plant, and equipment, net 176,417       121,147       176,417 121,147  
Other                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 1,865 1,281 2,278
Property, plant, and equipment, net 6,946       8,977       6,946 8,977  
Portugal                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Property, plant, and equipment, net 33,092       31,872       33,092 31,872  
Macedonia                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Property, plant, and equipment, net 12,135       12,906       12,135 12,906  
BULGARIA                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Property, plant, and equipment, net 6,014       5,480       6,014 5,480  
Sweden                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Property, plant, and equipment, net 562       4,800       562 4,800  
Total Non-United States                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 1,013,733 1,089,838 967,048
Property, plant, and equipment, net $ 483,644       $ 438,185       483,644 438,185  
Hong Kong                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 195,898 188,102 169,073
Germany                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 99,166 124,805 105,548
Europe                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 84,504 76,149 64,248
Taiwan                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 58,364 88,853 78,728
Asia [Member]                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 46,455 47,233 36,647
United Kingdom                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 29,070 42,472 37,038
Netherlands                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 39,329 44,065 39,684
Malaysia                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 23,750 33,748 28,165
Singapore                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Net sales                 $ 23,047 $ 19,417 $ 17,267
Minimum | Net sales | Sales risk                      
Net sales and property, plant and equipment, goodwill, intangible assets                      
Concentration risk, percentage                 10.00% 10.00% 10.00%