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Stock-Based Compensation (Detail) - (Table 1) - shares		9 Months Ended
	Jun. 30, 2020	Sep. 30, 2020	May 24, 2019
Share-based Payment Arrangement [Abstract]
Common stock authorized			11,000,000
Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled		(1,977,921)
Common stock available for grant of stock-based awards as of June 30, 2012		9,022,079
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	225,000	499,000

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Number of shares authorized for issuance under share-based payment arrangement.

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

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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