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Reconciliation of Weighted Average Shares Outstanding (Details) - shares
3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Reconciliation of Weighted Average Shares Outstanding [Abstract]    
Weighted average shares outstanding (in shares) 56,564,000 57,510,000
Less: Unvested restricted shares (in shares) (28,000) (80,000)
Shares used for basic earnings per share (in shares) 56,536,000 57,430,000
Dilutive effect of stock options and other stock awards (in shares) 369,000 684,000
Shares used for diluted earnings per share (in shares) 56,905,000 58,114,000
Stock Options [Member] | Class A Common [Member]    
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]    
Anti-dilutive shares excluded from diluted EPS calculation (in shares) 252,704 0
Warrants [Member]    
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]    
Warrants issued during period (in shares)   0
Warrants [Member] | Class A Common [Member]    
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]    
Anti-dilutive shares excluded from diluted EPS calculation (in shares) 511,094  
Restricted Stock [Member]    
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]    
Anti-dilutive shares excluded from diluted EPS calculation (in shares) 0 0