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Income Taxes - Unrecognized Tax Benefit (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 30, 2017	Jan. 29, 2017	Apr. 30, 2017
Income Tax Disclosure [Abstract]
Reduction to unrecognized tax benefits resulting from a lapse of the applicable statute of limitations	$ 1,300	$ 2,100	$ 3,431

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- References

No definition available.

+ Details

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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

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