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Stockholders' Equity and Noncontrolling Interests - Change in the Number of Shares of Common Stock Outstanding (Details) - shares
6 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Common Stock Outstanding Roll Forward    
Shares outstanding, beginning balance (in shares) 41,915,000  
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes (in shares) 233,391  
Shares outstanding, ending balance (in shares) 42,148,391  
Treasury stock (in shares) 12,680,105 12,680,105