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Summary of Significant Accounting Policies (Goodwill) (Details) (USD $) | Sep. 30, 2012 | Jun. 30, 2012 industry | Sep. 30, 2011 | Jun. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
--- | --- | --- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |  |
Market capitalization | $ 263,300,000 | $ 264,300,000 |  |  |  |
Carrying value | $ 270,857,000 | $ 265,700,000 | $ 260,716,000 |  | $ 240,556,000 | $ 229,586,000
Control premium percent | 40.00% | 40.00% |  |  |  |
Percent fair value in excess of carrying value of goodwill | 36.00% | 39.00% |  | 28.60% |  |
Number of industries encompasses similar products |  | 3 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Control premium percent |  | 30.00% |  |  |  |
Target company's equity benchmark |  | 50.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Control premium percent |  | 45.00% |  |  |  |

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- Definition Goodwill, Impairment Test Benchmark, Equity in Acquiree Company, Percent + References No definition available. + Details
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- Definition Goodwill, Impairment Test, Control Premium, Percent + References No definition available. + Details
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- Definition Goodwill, Impairment Test, Market Capitalization + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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