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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Sep. 30, 2014 | $ 265,298 | $ 307 | $ (53,237) | $ 218,689 | $ 117,816 | $ (18,277)
Beginning balance (in shares) at Sep. 30, 2014 |  | 30,704 | 6,314 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 6,588 |  |  |  | 6,588 |
Other comprehensive income (loss) | (4,336) |  |  |  |  | (4,336)
Employee stock purchase issuances (in shares) |  |  | (124) |  |  |
Employee stock purchase issuances | 925 |  | $ 1,041 | (116) |  |
Repurchase of common stock (in shares) |  |  | 297 |  |  |
Repurchase of common stock | (2,339) |  | $ (2,339) |  |  |
Issuance of stock under stock award plans (in shares) |  | 830 |  |  |  |
Issuance of stock under stock award plans | 6,559 | $ 8 |  | 6,551 |  |
Tax impact from equity awards | (2,058) |  |  | (2,058) |  |
Stock-based compensation expense | 4,301 |  |  | 4,301 |  |
Ending balance (in shares) at Sep. 30, 2015 |  | 31,534 | 6,487 |  |  |
Ending balance at Sep. 30, 2015 | 274,938 | $ 315 | $ (54,535) | 227,367 | 124,404 | (22,613)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 16,708 |  |  |  | 16,708 |
Other comprehensive income (loss) | (2,078) |  |  |  |  | (2,078)
Employee stock purchase issuances (in shares) |  |  | (104) |  |  |
Employee stock purchase issuances | 896 |  | $ 876 | 20 |  |
Repurchase of common stock (in shares) |  |  | 48 |  |  |
Repurchase of common stock | (550) |  | $ (550) |  |  |
Issuance of stock under stock award plans (in shares) |  | 937 |  |  |  |
Issuance of stock under stock award plans | 7,191 | $ 10 |  | 7,181 |  |
Tax impact from equity awards | (914) |  |  | (914) |  |
Accelerated vesting of Etherios stock award plans | 184 |  |  | 184 |  |
Stock-based compensation expense | 3,654 |  |  | 3,654 |  |
Ending balance (in shares) at Sep. 30, 2016 |  | 32,471 | 6,431 |  |  |
Ending balance at Sep. 30, 2016 | 300,029 | $ 325 | $ (54,209) | 237,492 | 141,112 | (24,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 9,366 |  |  |  | 9,366 |
Other comprehensive income (loss) | 2,032 |  |  |  |  | 2,032
Employee stock purchase issuances (in shares) |  |  | (72) |  |  |
Employee stock purchase issuances | 685 |  | $ 614 | 71 |  |
Repurchase of common stock (in shares) |  |  | 78 |  |  |
Repurchase of common stock | (938) |  | $ (938) |  |  |
Issuance of stock under stock award plans (in shares) |  | 537 |  |  |  |
Issuance of stock under stock award plans | 3,502 | $ 5 |  | 3,497 |  |
Tax impact from equity awards | (191) |  |  | (191) |  |
Stock-based compensation expense | 4,659 |  |  | 4,659 |  |
Ending balance (in shares) at Sep. 30, 2017 |  | 33,008 | 6,437 |  |  |
Ending balance at Sep. 30, 2017 | $ 319,144 | $ 330 | $ (54,533) | $ 245,528 | $ 150,478 | $ (22,659)

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