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Stock-Based Compensation Plans - Summary of Stock Activity (Details) (USD $) | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Options outstanding at beginning of period | 606,025 | 633,900 | 713,790 |
Options granted | 31,690 | 29,160 | 27,210 |
Options exercised | 153,505 | 54,035 | 107,100 |
Options forfeited | 3,000 | 3,000 | 0 |
Options outstanding at end of period | 481,210 | 606,025 | 633,900 | 713,790
Options outstanding weighted average exercise price at beginning of period | $ 14.96 | $ 14.00 | $ 12.23 |
Options outstanding weighted average exercise price - Granted | $ 22.25 | $ 25.60 | $ 32.16 |
Options outstanding weighted average exercise price - Exercised | $ 8.62 | $ 9.95 | $ 6.83 |
Options outstanding weighted average exercise price - forfeited | $ 5.78 | $ 5.84 | $ 0 |
Options outstanding weighted average exercise price at end of period | $ 17.52 | $ 14.96 | $ 14.00 | $ 12.23
Options outstanding weighted average remaining term | 3.8 | 3.5 | 4.1 | 4.5
Options outstanding weighted average grant date fair value at beginning of period | $ 4,216 | $ 4,206 | $ 4,246 |
Options outstanding weighted average grant date fair value | 281 | 293 | 349 |
Options exercised weighted average grant date fair value | 705 | 274 | 389 |
Options forfeited weighted average grant date fair value | 10 | 9 | 0 |
Options outstanding weighted average grant date fair value at end of period | 3,782 | 4,216 | 4,206 | 4,246
Options exerciseable at September 30, 2012 | 410,766 |  |  |
Options exerciseable weighted average exercise price | $ 16.18 |  |  |
Options exerciseable weighted average remaining term | 3.0 |  |  |
Options exerciseable weighted average grant date fair value | 3,035 |  |  |
Options vested during twelve months ended September 30, 2012 | 35,574 |  |  |
Options vested weighted average grant date fair value | $ 370 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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