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Net Income Per Share Data - Denominator for Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |
Net income available to common shareholders | $ 148 | $ 1,310
Basic weighted average shares outstanding | 13,469 | 13,367
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units, deferred stock units and performance shares | 300 | 460
Diluted weighted average shares outstanding | 13,769 | 13,827

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