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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Sep. 30, 2013
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Goodwill and Intangible Assets Disclosure [Line Items] |  |
Intangible assets, gross | $ 140.5 | $ 141.2

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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