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Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Jan. 31, 2015
Cash dividends paid, per share	$ 0.35us-gaap_CommonStockDividendsPerShareCashPaid
Stock options exercised, shares	29,075us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Treasury stock, shares	1,159us-gaap_TreasuryStockSharesAcquired
Common Stock [Member]
Stock options exercised, shares	29,075us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Additional Paid-in Capital [Member]
Stock options exercised, shares	29,075us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Treasury Stock [Member]
Stock options exercised, shares	29,075us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury stock, shares	1,159us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Retained Earnings [Member]
Cash dividends paid, per share	$ 0.35us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

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