Effect of Derivative Instruments on Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on derivative	$ 110	$ 74
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI on derivatives (effective portion)	(735)	956
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(464)	(269)
Gain Recognized on Derivative (Ineffective portion and Amount Excluded from Effectiveness Testing)	494	170
Foreign Exchange Forward \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI on derivatives (effective portion)	600	955
Foreign Exchange Forward \| Interest and Foreign Exchange \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on derivative	54	74
Gain Recognized on Derivative (Ineffective portion and Amount Excluded from Effectiveness Testing)	494	170
Foreign Exchange Forward \| Sales \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(8)	150
Interest rate swap contracts \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI on derivatives (effective portion)	(1,335)	1
Interest rate swap contracts \| Interest and Foreign Exchange \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on derivative	56
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (456)	$ (419)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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=35706170&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 50

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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