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Reconciliation of Weighted Average Shares Outstanding and Share Repurchases (Details) - $ / shares
 3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]    
Weighted average shares outstanding (in shares) 57,188,000 57,665,000
Less: Unearned restricted shares (in shares) (172,000) (227,000)
Shares used for basic earnings per share (in shares) 57,016,000 57,438,000
Dilutive effect of stock options and other stock awards (in shares) 693,000 738,000
Shares used for diluted earnings per share (in shares) 57,709,000 58,176,000
Shares repurchased (in shares) 265,158 221,305
Average purchase price (in dollars per share) $ 52.86 $ 51.01
Restricted Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from diluted EPS calculation (in shares) 0 44,650
Stock Options [Member] | Class A Common [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from diluted EPS calculation (in shares) 292,852 331,575