Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Cash Flows (Details)

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Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 206,587 $ 254,127 $ 47,157
Depreciation and amortization (1) 52,628 50,661 38,151
Change in deferred income taxes (1) (49,757) 564 (15)
Other Noncash Income (Expense) (285) (680) (392)
Increase (Decrease) in Accounts Receivable (8,910) 30,217 (2,630)
Other operating liabilities (1) (70,627) 197 1,694
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 131,731 120,761 71,667
Effect of foreign currency fluctuations on cash (2) $ (6,990) 9,745 (1,174)
Restatement Adjustment | Accounting Standards Update 2014-09 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   (402) (832)
Depreciation and amortization (1)   906 813
Change in deferred income taxes (1)   (49) 4
Other Noncash Income (Expense)   (609) (65)
Increase (Decrease) in Accounts Receivable   133 (2,618)
Other operating liabilities (1)   84 2,762
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   (99) 0
Effect of foreign currency fluctuations on cash (2)   99  
Scenario, Previously Reported      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   254,529 47,989
Depreciation and amortization (1)   49,755 37,338
Change in deferred income taxes (1)   613 (19)
Other Noncash Income (Expense)   (71) (327)
Increase (Decrease) in Accounts Receivable   30,084 (12)
Other operating liabilities (1)   113 (1,068)
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   120,860 $ 71,667
Effect of foreign currency fluctuations on cash (2)   $ 9,646