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Gains Losses on Derivative Financial Instruments Recorded in Consolidated Statements of Income (Detail) (Foreign currency forward contracts, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Foreign currency forward contracts |  |  |
Derivative [Line Items] |  |  |
Gain on foreign currency forward contracts | $ 256 | $ 25 | $ 453

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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