Supplementary Information Supplementary Info - Impairment and Restructuring (Details) - USD ($)	12 Months Ended
	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018
Other Nonrecurring Expense	$ 433,000	$ 57,748,000	$ 313,130,000
Goodwill, Impairment Loss		49,282,000	313,130,000
Other Asset Impairment Charges		8,466,000
Restructuring and other charges	18,567,000	7,233,000	5,429,000
Accrued Liabilities, Current	95,420,000	121,720,000
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	2,695,000	2,274,000
Write off of Deferred Debt Issuance Cost		118,000
Employee Severance [Member]
Restructuring and other charges	12,667,000	4,554,000
Accrued Liabilities, Current	10,370,000
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring and other charges	587,000
Facility Closing [Member]
Restructuring and other charges	223,000	281,000
Other Restructuring [Member]
Restructuring and other charges		$ 2,679,000
Other Expense [Member]
Other Nonrecurring Expense	$ 2,841,000
Max Roberts [Member]
Deferred Compensation Arrangement with Individual, Compensation Expense			$ 5,429,000