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Contingencies and Commitments (Details) - Civil lawsuit - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 21 Months Ended
Jan. 27, 2018
Apr. 30, 2016
Oct. 28, 2017
Contingencies and Commitments      
Expense recognized   $ 5.5  
Accrual of royalties and interest      
Contingencies and Commitments      
Expense recognized     $ 3.9
Agreement to settle      
Contingencies and Commitments      
Expense recognized $ 4.1    
Agreed settlement amount $ 13.5