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Stock Option and Incentive Plan - Summary of Restricted Shares Activity (Detail)
shares in Thousands
12 Months Ended
Sep. 30, 2015
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Restricted Shares, Outstanding, Beginning Balance | shares 1,886
Number of Restricted Shares, Granted | shares 665
Number of Restricted Shares, Vested | shares (810)
Number of Restricted Shares, Forfeited | shares (130)
Number of Restricted Shares, Ending Balance | shares 1,611
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 36.09
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares 49.80
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares 34.62
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares 38.10
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 42.33