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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 executive | Sep. 30, 2013 | Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |
Rent expense under operating leases | $ 19.4 | $ 22.1 | $ 21.3
Number of executives in a management agreement providing for certain payments and other benefits in the event of a qualified change | 23 |  |

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- Definition Number Of Executives Included In Plan + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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