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Fair Value of Derivatives as Defined by Accounting Standard (Detail) - USD ($) $ in Thousands	Jul. 30, 2017	Jul. 31, 2016
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, Assets		$ 309
Derivatives not designated as hedging instruments, Assets	$ 6	9
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, Assets	704	$ 695
Other Long Term Liabilites
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, Liabilities	$ (90)

X

- Definition

Fair value of all asset derivatives designated as cash flow 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 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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Period Type:	instant

X

- Definition

Fair value of all liability derivatives designated as cash flow 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 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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- Definition

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+ References

No definition available.

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- Definition

Fair value as of the balance sheet date of all foreign currency derivative assets not designated 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 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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