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The Incentive Stock Plans (Tables) | 12 Months Ended
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Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Incentive Stock Plans Option Activity | The following table summarizes option activity from September 30, 2015 through September 30, 2016:
|  | Shares Available for Grant |  |  | Options Outstanding |  |  | Aggregate Intrinsic Value (in thousands) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life |
Balance as of September 30, 2015 |  |  | 829,854 |  |  |  | 1,937,874 |  |  | $ | 6,285 |  |  | $ | 12.95 |  |  |  | 6.5 |
Options authorized |  |  | — |  |  |  | — |  |  |  |  |  |  |  | — |  |  |  |  |
Options granted |  |  | (5,000 | ) |  |  | 5,000 |  |  |  |  |  |  |  | 16.97 |  |  |  |  |
Options cancelled/forfeited/expired |  |  | 219,262 |  |  |  | (219,262 | ) |  |  |  |  |  |  | 24.70 |  |  |  |  |
Options exercised |  |  | — |  |  |  | (272,510 | ) |  |  |  |  |  |  | 6.89 |  |  |  |  |
Restricted stock awards granted |  |  | (281,260 | ) |  |  | — |  |  |  |  |  |  |  | — |  |  |  |  |
Restricted stock awards forfeited |  |  | 11,500 |  |  |  | — |  |  |  |  |  |  |  | — |  |  |  |  |
Additional shares of stock issued |  |  | (42,253 | ) |  |  | — |  |  |  |  |  |  |  | — |  |  |  |  |
Balance as of September 30, 2016 |  |  | 732,103 |  |  |  | 1,451,102 |  |  | $ | 12,397 |  |  | $ | 12.33 |  |  |  | 6.0 |
Exercisable as of September 30, 2016 |  |  |  |  |  |  | 767,434 |  |  | $ | 9,064 |  |  | $ | 9.21 |  |  |  | 4.8 |
Weighted Average Assumptions of Incentive Stock Plans | The following are the weighted-average assumptions used for the fiscal years ended September 30,
|  | 2014 |  |  | 2015 |  |  | 2016 |
Dividend yield |  |  | 0.0% |  |  |  | 0.0% |  |  |  | 0.0% |
Risk-free interest rate |  |  | 0.7% |  |  |  | 0.9% |  |  |  | 1.0% |
Volatility |  |  | 55.7% |  |  |  | 47.4% |  |  |  | 48.2% |
Expected life |  | 3.2 years |  |  | 3.1 years |  |  | 5.0 years |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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