Dividends [Line Items]

No definition available.

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- Definition

The percentage of an approved increase in the quarterly cash dividend rate.

+ References

No definition available.

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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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- Details

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Dividend Program (Detail) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Jan. 28, 2018	Jan. 29, 2017
Dividends [Line Items]
Cash dividends paid			$ 5,722	$ 5,292
Special Dividend [Member]
Dividends [Line Items]
Cash dividends paid			$ 2,600	$ 2,600
Cash dividend payment, per share			$ 0.21	$ 0.21
Quarterly Dividend [Member]
Dividends [Line Items]
Cash dividend declared, per share		$ 0.08
Cash dividends paid			$ 3,100	$ 2,700
Quarterly Dividend [Member] \| Minimum [Member]
Dividends [Line Items]
Cash dividend payment, per share			$ 0.08	$ 0.07
Quarterly Dividend [Member] \| Maximum [Member]
Dividends [Line Items]
Cash dividend payment, per share			$ 0.09	$ 0.08
Subsequent Event [Member] \| Quarterly Dividend [Member]
Dividends [Line Items]
Increase in cash dividend, percentage	12.50%
Cash dividend declared, per share	$ 0.09
Date of payment to shareholders entitled to dividends	Apr. 16, 2018
Date of record of shareholders entitled to dividends	Apr. 02, 2018