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Stock-Based Compensation Plans (Tables) - Summary of Stock Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Mar. 31, 2014 Years | Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Options outstanding at October 1, 2013 | 414,590 |
Options granted | 31,790 |
Options exercised | 55,699 |
Options outstanding at March 31, 2014 | 390,681 |
Options outstanding weighted average exercise price-beginning balance | $ 20.40 |
Options outstanding weighted average exercise price - Granted | $ 41.39 |
Options outstanding weighted average exercise price - Exercised | $ 12.01 |
Options outstanding weighted average exercise price - Ending balance | $ 23.30 |
Options outstanding weighted average remaining term | 4.7 | 4.2
Options outstanding weighted average grant date fair value - beginning balance | $ 3,668 |
Options granted weighted average grant date fair value | 545 |
Options exercised weighted average grant date fair value | 335 |
Options outstanding weighted average grant date fair value - ending balance | 3,878 |
Options exercisable at March 31, 2014 | 303,527 |
Options exerciseable weighted average exercise price | $ 21.39 |
Options exerciseable weighted average remaining term | 3.6 |
Options exerciseable weighted average grant date fair value | 2,745 |
Options vested during six months ended March 31, 2014 | 28,348 |
Options vested weighted average grant date fair value | $ 322 |

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