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Other Compensation Plans - Schedule of Deferred Compensation Liabilities (Details) - USD ($)
$ in Thousands
Oct. 27, 2017
Apr. 28, 2017
Compensation and Retirement Disclosure [Line Items]    
Other non-current compensation arrangements $ 93 $ 110
Total deferred compensation liabilities 18,975 21,324
Less current portion (1,850) (4,047)
Non-current deferred compensation liabilities 17,125 17,277
BEEDP and BEDDP Plans    
Compensation and Retirement Disclosure [Line Items]    
Liability for deferred cash obligations 12,294 13,986
Liability for deferred share-based obligations in BEEDP and BEDDP Plans 892 1,398
SERP Plan    
Compensation and Retirement Disclosure [Line Items]    
Liability for deferred cash obligations $ 5,696 $ 5,830