Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies - OCI (Details)

v3.20.1
Organization and Significant Accounting Policies - OCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance $ 639,415 $ 463,875 $ 155,569
Other comprehensive income (loss) before reclassifications (4)(5) (30,627) (28,959)  
Amounts reclassified out of AOCI 6,231 (1,033)  
Other comprehensive income (loss) (36,858) (27,926)  
Balance 647,262 639,415 463,875
Foreign currency translation gains (losses)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance (14,350) 9,715  
Other comprehensive income (loss) before reclassifications (4)(5) 5,097 (19,835)  
Amounts reclassified out of AOCI (10,278) (4,230)  
Other comprehensive income (loss) (5,181) (24,065)  
Balance (19,531) (14,350) 9,715
Defined benefit post-retirement plan adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance 793 879  
Other comprehensive income (loss) before reclassifications (4)(5) 2 81  
Amounts reclassified out of AOCI (149) (167)  
Other comprehensive income (loss) (147) (86)  
Balance 646 793 879
Defined benefit pension plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance (15,758) (14,831)  
Other comprehensive income (loss) before reclassifications (4)(5) (302) (1,525)  
Amounts reclassified out of AOCI 862 598  
Other comprehensive income (loss) 560 (927)  
Balance (15,198) (15,758) (14,831)
Other Comprehensive Income (Loss), Tax 3,500 2,400 2,300
Defined Benefit Pension Plans, tax benefit 1,100 200  
Equity interest in investee's other comprehensive loss      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance 274 285  
Other comprehensive income (loss) before reclassifications (4)(5) 0 (11) 5,584
Amounts reclassified out of AOCI 0 0  
Other comprehensive income (loss) 0 (11)  
Balance 274 274 285
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance 566 1,154  
Other comprehensive income (loss) before reclassifications (4)(5) (35,078) (1,286)  
Amounts reclassified out of AOCI 1,559 698  
Other comprehensive income (loss) (33,519) (588)  
Balance (32,953) 566 1,154
Accumulated Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, net [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance (2,249) 0  
Other comprehensive income (loss) before reclassifications (4)(5) (346) (6,383)  
Amounts reclassified out of AOCI (1,775) (4,134)  
Other comprehensive income (loss) 1,429 (2,249)  
Balance (820) (2,249) 0
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance (30,724) (2,798) (41,812)
Balance (67,582) (30,724) (2,798)
Cash Flow Hedging [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax (24,300)    
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Net Investment Hedging [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax 18,152 $ 5,009 $ 0
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Cash Flow Hedging [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ (21,656)