Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Changes in Stockholders' Equity (Details)

v3.19.1
Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Changes in Stockholders' Equity (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 206,587 $ 254,127 $ 47,157  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     1,726  
Stockholders' Equity Attributable to Parent 639,415 463,875 155,569 $ 112,481
Other comprehensive income (loss) (2) (27,926) 39,014 (10,387)  
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  
Stockholders' Equity Attributable to Parent   462,963 154,472  
Other comprehensive income (loss) (2)   38,797    
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)  
Stockholders' Equity Attributable to Parent   912 1,097  
Other comprehensive income (loss) (2)   217    
Accumulated Other Comprehensive Income (Loss)        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   0    
Stockholders' Equity Attributable to Parent (30,724) (2,798) (41,812) (31,425)
Other comprehensive income (loss) (2) (27,926) 39,014 (10,387)  
Accumulated Other Comprehensive Income (Loss) | Scenario, Previously Reported        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Stockholders' Equity Attributable to Parent   (3,015)    
Other comprehensive income (loss) (2)   38,797    
Accumulated Other Comprehensive Income (Loss) | Restatement Adjustment | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Stockholders' Equity Attributable to Parent   217    
Other comprehensive income (loss) (2)   217    
Retained Earnings (Deficit)        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   0 1,596  
Stockholders' Equity Attributable to Parent 204,195 3,370 (250,757) $ (299,510)
Other comprehensive income (loss) (2) $ 0 0 0  
Retained Earnings (Deficit) | Scenario, Previously Reported        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     (333)  
Stockholders' Equity Attributable to Parent   2,675 (251,854)  
Retained Earnings (Deficit) | Restatement Adjustment | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     1,929  
Stockholders' Equity Attributable to Parent   $ 695 $ 1,097