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Summary of Significant Accounting Policies (Detail 6) (Restricted shares, USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Earnings per Share |  |  |  |
Unvested restricted shares | 1,897,827 | 1,543,869 | 1,399,609 | 1,294,082
Issue price (in dollars per share) | $ 24.96 | $ 28.89 | $ 22.51 | $ 13.13
Unvested shares included in calculation of diluted income per share | 341,137 | 383,831 |  |
Minimum |  |  |  |
Earnings per Share |  |  |  |
Issue price (in dollars per share) | $ 7.48 | $ 7.48 | $ 7.48 |
Maximum |  |  |  |
Earnings per Share |  |  |  |
Issue price (in dollars per share) | $ 52.55 | $ 52.55 | $ 52.55 |

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that have been included in the calculation of diluted earnings per share. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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