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Stock Option and Incentive Plan - Summary of Restricted Stock and Restricted Stock Units Activity (Detail)
shares in Thousands
12 Months Ended
Sep. 30, 2022
$ / shares
shares
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
Number of Restricted Shares, Outstanding, Beginning Balance | shares 1,366
Number of Restricted Shares, Granted | shares 1,080
Number of Restricted Shares, Vested | shares (539)
Number of Restricted Shares, Forfeited | shares (133)
Number of Restricted Shares, Ending Balance | shares 1,774
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 66.57
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares 73.71
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares 65.86
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares 70.59
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 70.83
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
Number of Restricted Shares, Outstanding, Beginning Balance | shares 221
Number of Restricted Shares, Granted | shares 325
Number of Restricted Shares, Vested | shares (77)
Number of Restricted Shares, Forfeited | shares (24)
Number of Restricted Shares, Ending Balance | shares 445
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 69.35
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares 72.31
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares 68.83
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares 71.26
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 71.5