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Derivatives Gain (Loss) on Derivative Instruments Designated as Hedges (Details)
$ in Thousands, ¥ in Billions
12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
JPY (¥)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2020
JPY (¥)
May 28, 2019
JPY (¥)
Derivative Instruments, Gain (Loss) [Line Items]            
Proceeds from Hedge, Financing Activities $ 6,476   $ 0 $ 0    
Cost of sales            
Derivative Instruments, Gain (Loss) [Line Items]            
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 3,111   (698) 2,420    
Currency Swap [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 2,600          
Currency Swap [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Amortization | ¥   ¥ 1.4        
Currency Swap [Member] | Net Investment Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Notional Amount $ 255,400       ¥ 28.9  
Derivative, Basis Spread on Variable Rate 6.25%       6.25%  
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ (21,656)          
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (4,670)          
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0          
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Fair Value Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax (346)   (6,383) 0    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (1,622)   (4,134) 0    
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 3,337   6,034 0    
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Net Investment Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax 18,152   5,009 0    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 10,278   4,230 0    
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0   0 0    
Currency Swap One [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Notional Amount | ¥           ¥ 15.1
Derivative, Fixed Interest Rate, Payments 4.88%       4.88%  
Foreign Exchange Forward [Member] | Cost of sales | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ (13,422)   (1,286) 667    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 3,111   (698) 2,420    
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0   $ 0 $ 0    
Currency Swap Two [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Notional Amount | ¥           ¥ 16.5
Derivative, Fixed Interest Rate, Payments 5.26%       5.26%  
JPY LIBOR [Member] | Currency Swap One [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Basis Spread on Variable Rate 2.00%       2.00%  
JPY LIBOR [Member] | Currency Swap Two [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Basis Spread on Variable Rate 2.25%       2.25%