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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	0 Months Ended			12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0
Amortization expense for intangible assets				$ 11,500,000	$ 9,200,000	$ 8,200,000

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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-Publisher FASB

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 28

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher FASB

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