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Stock-Based Compensation - Stock Option Grants (Detail) - $ / shares
12 Months Ended
Apr. 30, 2014
Dec. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options Granted (shares)   161,000
Exercise Price (usd per share)   $ 28.89
Fair Value (usd per share)   $ 6.26
2014 Omnibus Share Incentive Plan (2014 Plan) | Chairman and Chief Executive Officer    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options Granted (shares) 161,000  
Exercise Price (usd per share) $ 28.89  
Fair Value (usd per share) $ 6.26