Earnings Per Share - Schedule of Earnings Per Share, Basic and Dilutive (Details) shares in Thousands	12 Months Ended
	Sep. 30, 2016 shares	Sep. 30, 2015 shares	Sep. 30, 2014 shares
Earnings Per Share [Abstract]
Basic shares	31,798	27,628	25,795
Shares issued upon conversion of TEUs		4,069	5,784
Shares issuable upon vesting/exercise of stock awards/options	5	75	216
Diluted shares	31,803	31,772	31,795
Senior Notes | Tangible Equity Units
Debt Instrument [Line Items]
Number of convertible equity instruments	5,200