CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Unearned ESOP Shares	Non-controlling Interests
Beginning Balance at Apr. 27, 2019	$ 1,480,507	$ 953	$ 131,460	$ (88,269)	$ 1,483,496	$ (50,381)	$ 3,248
Beginning Balance (in shares) at Apr. 27, 2019		95,272,000
Foreign currency translation	(3,799)			(3,799)
Cash flow hedges	554			554
Net income (loss)	29,807				30,042		(235)
Dividends declared	(24,856)				(24,856)
Common stock issued and related tax benefits	(5,369)	$ 2	(5,371)
Common stock issued and related tax benefits (in shares)		198,000
Stock based compensation	6,634		6,634
ESOP activity	18,452					18,452
Ending Balance at Jul. 27, 2019	1,503,377	$ 955	132,723	(94,221)	1,492,836	(31,929)	3,013
Ending Balance (in shares) at Jul. 27, 2019		95,470,000
Foreign currency translation	6,614			6,614
Cash flow hedges	554			554
Net income (loss)	(33,349)				(33,129)		(220)
Dividends declared	(24,874)				(24,874)
Common stock issued and related tax benefits	733	$ 2	731
Common stock issued and related tax benefits (in shares)		245,000
Stock based compensation	5,569		5,569
Ending Balance at Oct. 26, 2019	1,458,624	$ 957	139,023	(87,053)	1,434,833	(31,929)	2,793
Ending Balance (in shares) at Oct. 26, 2019		95,715,000
Foreign currency translation	2,619			2,619
Cash flow hedges	6,627			6,627
Net income (loss)	22,972				23,227		(255)
Dividends declared	(24,897)				(24,897)
Common stock issued and related tax benefits	464	$ 1	463
Common stock issued and related tax benefits (in shares)		77,000
Stock based compensation	5,559		5,559
Ending Balance at Jan. 25, 2020	1,471,968	$ 958	145,045	(77,807)	1,433,163	(31,929)	2,538
Ending Balance (in shares) at Jan. 25, 2020		95,792,000
Foreign currency translation	(19,496)			(19,496)
Cash flow hedges	264			264
Net income (loss)	(608,797)				(608,586)		(211)
Dividends declared	(24,925)				(24,925)
Common stock issued and related tax benefits	(3,612)	$ 1	(3,613)
Common stock issued and related tax benefits (in shares)		155,000
Stock based compensation	5,174		5,174
ESOP activity	15,868					15,868
Ending Balance at Apr. 25, 2020	$ 836,444	$ 959	146,606	(97,039)	799,652	(16,061)	2,327
Ending Balance (in shares) at Apr. 25, 2020	95,947,000	95,947,000
Cumulative Effect of New Accounting Principle in Period of Adoption | ASU 2016-02	$ 1,447				1,447
Foreign currency translation	12,589			12,589
Cash flow hedges	260			260
Net income (loss)	24,202				24,407		(205)
Dividends declared	(24,472)				(24,472)
Common stock issued and related tax benefits	(895)	$ 4	(899)
Common stock issued and related tax benefits (in shares)		309,000
Stock based compensation	6,610		6,610
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | ASU 2018-02				(2,707)	2,707
Ending Balance at Jul. 25, 2020	$ 854,738	$ 963	$ 152,317	$ (84,190)	$ 799,587	$ (16,061)	$ 2,122
Ending Balance (in shares) at Jul. 25, 2020	96,256,000	96,256,000