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The Incentive Stock Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Feb. 29, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Jan. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant fair value of options granted		$ 25.29
Options granted			0	0
Total intrinsic value of options exercised		$ 1.8	$ 3.8	$ 1.4
Unrecognized compensation cost related to non-vested restricted stock awards		$ 0.1
Weighted average period unrecognized compensation costs related to non-vested restricted awards are expected to be recognized		2 years
Incentive Stock Plan 2011 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized					3,200,456
Additional common shares authorized	1,000,000
Expiration of Plan 2011		2030-02
Contractual term of plan 2011		10 years
Incentive Stock Plan 2011 [Member] | Subject To Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized		4,000,000
Incentive Stock Plan 2011 [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized	4,200,456
Incentive Stock Plan 2007 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Common stock shares available		200,456

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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