Dividends [Line Items]

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Dividend Program (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended									12 Months Ended
	Jun. 13, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	Aug. 02, 2015	Apr. 29, 2018	Apr. 30, 2017	May 01, 2016
Dividends [Line Items]
Cash dividends paid		$ 1,121	$ 1,119	$ 995	$ 3,608	$ 988	$ 985	$ 862	$ 3,445		$ 6,843	$ 6,280	$ 8,140
Cash dividend payment, per share		$ 0.09	$ 0.09	$ 0.08	$ 0.29	$ 0.08	$ 0.08	$ 0.07	$ 0.28
Special Dividend [Member]
Dividends [Line Items]
Cash dividends paid									$ 2,600	$ 5,000	$ 2,600
Cash dividend payment, per share									$ 0.21	$ 0.40	$ 0.21
Quarterly Dividend [Member]
Dividends [Line Items]
Cash dividends paid											$ 4,200	$ 3,700	$ 3,100
Quarterly Dividend [Member] \| Minimum [Member]
Dividends [Line Items]
Cash dividend payment, per share											$ 0.08	$ 0.07	$ 0.06
Quarterly Dividend [Member] \| Maximum [Member]
Dividends [Line Items]
Cash dividend payment, per share											$ 0.09	$ 0.08	$ 0.07
Subsequent Event [Member] \| Quarterly Dividend [Member]
Dividends [Line Items]
Cash dividend declared, per share	$ 0.09
Date of payment to shareholders entitled to dividends	Jul. 16, 2018
Date of record of shareholders entitled to dividends	Jul. 02, 2018