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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 27, 2019
Apr. 24, 2021
Apr. 25, 2020
Apr. 27, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   $ 716,306 $ 696,976 $ 625,216
Changes before reclassifications   5,264 (3,363) (2,856)
Reclassification of certain income tax effects     (547)  
Amounts reclassified to net income (3)   338 91 26,858
Tax effect   (171) 329 (628)
Total other comprehensive income   5,431 (3,490) 21,737
Ending balance $ 696,976 782,146 716,306 696,976
Amount of pension termination charge reclassified from AOCI 23,800 0 0 23,807
Pension termination charge 28,200      
Income tax expense 4,400      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   716,306 696,976 625,216
Net income   107,529 78,984 70,141
Other comprehensive income (loss)   5,965 (3,209) 23,240
Change in noncontrolling interests     156  
Ending balance 696,976 782,146 716,306 696,976
Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance       (1,637)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance       (1,637)
Translation adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   (1,891) 50 2,388
Changes before reclassifications   4,932 (1,941) (2,338)
Reclassification of certain income tax effects     0  
Amounts reclassified to net income (3)   0 0 0
Tax effect   0 0 0
Total other comprehensive income   4,932 (1,941) (2,338)
Ending balance 50 3,041 (1,891) 50
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   (1,891) 50 2,388
Ending balance 50 3,041 (1,891) 50
Translation adjustment | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance       0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance       0
Change in fair value of cash flow hedge        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   0 87 154
Changes before reclassifications   0 0 (369)
Reclassification of certain income tax effects     (97)  
Amounts reclassified to net income (3)   0 14 280
Tax effect   0 (4) 22
Total other comprehensive income   0 (87) (67)
Ending balance 87 0 0 87
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   0 87 154
Ending balance 87 0 0 87
Change in fair value of cash flow hedge | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance       0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance       0
Unrealized gain (loss) on marketable securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   449 6 1,376
Changes before reclassifications   (96) 387 330
Reclassification of certain income tax effects     258  
Amounts reclassified to net income (3)   (9) (141) 25
Tax effect   26 (61) (88)
Total other comprehensive income   (79) 443 (1,370)
Ending balance 6 370 449 6
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   449 6 1,376
Ending balance 6 370 449 6
Unrealized gain (loss) on marketable securities | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance       (1,637)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance       (1,637)
Net pension amortization and net actuarial loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   (5,510) (3,605) (29,117)
Changes before reclassifications   428 (1,809) (479)
Reclassification of certain income tax effects     (708)  
Amounts reclassified to net income (3)   347 218 26,553
Tax effect   (197) 394 (562)
Total other comprehensive income   578 (1,905) 25,512
Ending balance (3,605) (4,932) (5,510) (3,605)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   (5,510) (3,605) (29,117)
Ending balance (3,605) (4,932) (5,510) (3,605)
Net pension amortization and net actuarial loss | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance      
AOCI Including Portion Attributable to Noncontrolling Interest        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   (6,952) (3,462) (25,199)
Ending balance (3,462) (1,521) (6,952) (3,462)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   (6,952) (3,462) (25,199)
Ending balance (3,462) (1,521) (6,952) (3,462)
AOCI Including Portion Attributable to Noncontrolling Interest | ASU 2016-01        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Unrealized gain (loss) on equity investments       (2,100)
Unrealized gain (loss) on equity investments, tax effect       (500)
Retained Earnings        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   343,633 325,847 291,644
Ending balance 325,847 399,010 343,633 325,847
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   343,633 325,847 291,644
Net income   106,461 77,469 68,574
Ending balance 325,847 399,010 343,633 325,847
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance       1,637
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance       1,637
Non-Controlling Interests        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance   15,553 14,468 13,035
Ending balance 14,468 8,648 15,553 14,468
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   15,553 14,468 13,035
Net income   1,068 1,515 1,567
Other comprehensive income (loss)   534 (266) (134)
Change in noncontrolling interests   (8,507) (164) 0
Ending balance $ 14,468 $ 8,648 $ 15,553 $ 14,468