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Earnings Per Share - Summary of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net Income (Loss) Available to Common Stockholders, Basic $ (75.6) $ 49.0 $ (413.7) $ (77.6)
Weighted Average Number of Shares Outstanding, Diluted 196,878 178,046 197,920 150,675
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements   1,281    
Incremental Common Shares Attributable To Conversion Of Restricted Stock Units   3,798    
Net income (loss) attributable to common and participating preferred stockholders $ (75.6) $ 49.0 $ (413.7) $ (77.6)
Dilutive adjustments to income (loss) attributable to common shares from assumed conversion of preferred shares, net of tax:        
Weighted-average common shares outstanding - basic 196,878 172,967 197,920 150,675
Net (loss) income per common share attributable to controlling interest:        
Basic (in dollars per share) $ (0.38) $ 0.28 $ (2.09) $ (0.52)
Diluted (in dollars per share) $ (0.38) $ 0.28 $ (2.09) $ (0.52)