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Stock Option and Incentive Plan - Summary of Restricted Shares Activity (Detail) shares in Thousands	12 Months Ended
	Sep. 30, 2020 $ / shares shares
Disclosure of Stock Option and Incentive Plan [Abstract]
Number of Restricted Shares, Outstanding, Beginning Balance | shares	937
Number of Restricted Shares, Granted | shares	659
Number of Restricted Shares, Vested | shares	(425)
Number of Restricted Shares, Forfeited | shares	(74)
Number of Restricted Shares, Ending Balance | shares	1,097
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 61.70
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares	70.03
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares	61.72
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares	63.61
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 66.57

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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