Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies Organization and Significant Accounting Polices - Contract Liabilities (Details)

v3.20.1
Organization and Significant Accounting Policies Organization and Significant Accounting Polices - Contract Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Separate Account, Liability [Line Items]      
Contract liabilities $ 6,035 $ 256  
Contract liabilities 60,638 13,412  
Contract with Customer, Liability 66,673 13,668  
Payments to Acquire Property, Plant, and Equipment 146,331 146,056 $ 65,004
Contract with Customer, Liability, Revenue Recognized 300 900 $ 300
Advanced Payment from Customer [Member]      
Separate Account, Liability [Line Items]      
Contract liabilities 56,500 $ 13,400  
Payments to Acquire Property, Plant, and Equipment 42,800    
Advanced Payment from Customer [Member] | Advanced Payment from Customer [Member]      
Separate Account, Liability [Line Items]      
Contract with Customer, Liability 72,000    
Maximum [Member] | Advanced Payment from Customer [Member]      
Separate Account, Liability [Line Items]      
Contract with Customer, Liability $ 1,800