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Net Earnings Per Share (Narrative) (Details)	3 Months Ended		9 Months Ended
Net Earnings Per Share (Narrative) (Details)	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	200,000	100,000
Shares of its common stock repurchased	0us-gaap_TreasuryStockSharesAcquired		163,326us-gaap_TreasuryStockSharesAcquired

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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