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Consolidated Statement of Stockholders' Equity (Parenthetical)	6 Months Ended
	Oct. 31, 2016 $ / shares shares
Cash dividends paid, per share | $ / shares	$ 0.28
Stock options exercised, shares	45,200
Common Stock [Member]
Stock options exercised, shares	45,200
Additional Paid-in Capital [Member]
Stock options exercised, shares	45,200
Retained Earnings [Member]
Cash dividends paid, per share | $ / shares	$ 0.28

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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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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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-Publisher FASB
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-Name Accounting Standards Codification
-Topic 210
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-Topic 505
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(2)
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