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Stockholders' Equity (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2012 | Nov. 30, 2007 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Jun. 30, 2012 | Aug. 31, 2010 | Sep. 30, 2009
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |
Share price in tender offer |  |  | $ 19.00 |  | $ 11.92 |  | $ 12.03 | $ 24.13
Stockholders' Equity (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ 50,000,000 | $ 35,000,000 |  |  |  |  |  |
Amount available for repurchases of shares |  |  | 300,000 |  |  | 55,300,000 |  |
Amount of tender offer for repurchases of shares |  |  | 55,000,000 |  |  |  |  |
Common stock repurchased, Shares |  |  | 2,894,253 | 0 |  |  |  |
Common stock repurchased |  |  | $ 54,991,000 |  | $ 2,032,000 |  |  |
Number of cumulative shares repurchased |  |  | 1,303,240 |  |  |  |  |
Stock repurchased average price per share |  |  | $ 26.86 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |
Share price in tender offer |  |  | $ 19.00 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |
Share price in tender offer |  |  | $ 17.00 |  |  |  |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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