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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) - USD ($)
shares in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Stockholders Equity [Line Items]    
Shares purchased and retired   1.6
Common stock and additional paid-in-capital reductions $ 14.5  
Charges to retained earnings $ 17.1  
Common Stock [Member]    
Stockholders Equity [Line Items]    
Shares purchased and retired 1.6