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EBook Settlement - Additional Information (Detail) - Apple Inc - Antitrust Lawsuit on Price of Digital Books - USD ($)
$ in Thousands
9 Months Ended
Jan. 27, 2018
Sep. 07, 2017
Jul. 01, 2017
Jan. 27, 2018
Loss Contingencies [Line Items]        
Credit settlement amount       $ 95,707
Redemptions receivable from Apple $ 0     0
Activated credit amount     $ 60,400  
Credit redeemed     $ 56,148  
Court Approved Redistribution        
Loss Contingencies [Line Items]        
Credit settlement amount   $ 14,815    
Redemptions receivable from Apple 1,674     1,674
Activated credit amount 9,370      
Credit redeemed 8,520      
Customer redemptions liability $ 10,180     $ 10,180