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Share-Based Compensation - Summary of Performance-Based Restricted Stock Units Outstanding Footnote (Detail)
12 Months Ended
Sep. 30, 2015
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Percentage of target payout on which performance-based restricted stock units are based 200.00%
Expected forfeited performance-based restricted stock units (shares) 68,000
Units in excess of the expected performance payout (shares) 528,000