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Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic net income per share	22,616,518	22,299,599	22,616,069	22,247,587
Effect of dilutive options and non-vested restricted stock awards	707,829	699,630	738,787	656,253
Weighted average common and common equivalent shares used in calculating diluted net income per share	23,324,347	22,999,229	23,354,856	22,903,840

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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-Section 50
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