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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
	Feb. 02, 2017	Jul. 31, 2017	Jul. 31, 2016
Accounting Changes And Error Corrections [Abstract]
Cumulative reduction to beginning retained earning	$ (984)
Recognition of previously unrecognized excess tax benefit	$ 224
Decrease in net cash used in financing activities			$ (50)
Increase in net cash used in operating activities			$ 50
Excess tax deficit		$ (1,604)

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Increase (Decrease) in Net Cash Provided By Used in Financing Activities

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Increase Decrease In Net Cash Provided By Used In Operating Activities

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

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