Income Taxes - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Apr. 24, 2021	Apr. 25, 2020
Deferred tax assets:
Capital accumulation plan	$ 1,051	$ 2,541
Inventory related items	12,250	10,354
Bad debt allowance	1,416	1,857
Stock-based compensation expense	7,036	7,486
Interest rate swap	1,261	1,580
Foreign tax credit	7,112	7,248
Lease liability	16,153	16,572
Other	242	2,945
Gross deferred tax assets	46,521	50,583
Less: Valuation allowance	(15,960)	(14,886)
Total net deferred tax assets	30,561	35,697
Deferred tax liabilities
LIFO reserve	(25,913)	(32,630)
Amortizable intangibles	(61,023)	(69,254)
Goodwill	(13,902)	(11,848)
Property and equipment, net	(37,967)	(39,999)
Operating lease right-of-use assets, net	(15,547)	(16,195)
Total deferred tax liabilities	(154,352)	(169,926)
Deferred net long-term income tax liability	$ (123,791)	$ (134,229)