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Restricted Share-Based Award Activity (Including Restricted Stock, Restricted Stock Units and Deferred Stock Units) (Detail) - Restricted Stock, Restricted Stock Units and Deferred Stock Units - $ / shares
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Number of Shares [Roll Forward]      
Beginning Balance 433,892 409,651 497,199
Granted 108,376 150,733 211,283
Vested (135,562) (81,597) (251,855)
Forfeited (25,197) (44,895) (46,976)
Ending Balance 381,509 433,892 409,651
Weighted Average Grant Date Fair Value      
Beginning Balance $ 52.55 $ 47.36 $ 45.75
Granted 63.85 59.35 44.80
Vested 47.33 41.88 40.87
Forfeited 58.44 47.43 53.54
Ending Balance $ 57.22 $ 52.55 $ 47.36