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Net (Loss) Income Per Share Data - Denominator for Computation of Basic and Diluted Net (Loss) Income Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Net income (loss) available to common shareholders | $ (2,682) | $ 720 | $ (2,704) | $ 3,526
Basic weighted average shares outstanding | 13,203 | 13,155 | 13,117 | 13,190
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units, deferred stock units and performance shares |  | 230 |  | 214
Diluted weighted average shares outstanding | 13,203 | 13,385 | 13,117 | 13,404

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