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Basis of Presentation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Mar. 31, 2018
Dec. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Increase (decrease) in retained earnings     $ 690,516 $ 937,663    
Accounting Standards Update 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Cumulative effect on retained earnings     7,900      
Restatement Adjustment | Accounting Standards Update 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Increase (decrease) in retained earnings     $ (3,400)   $ 8,400 $ 2,900
Restatement Adjustment | Accounting Standards Update 2017-07            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Reclassification of net periodic benefit cost $ 1,900 $ 5,700