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Segment Reporting - Information about Reportable Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 23, 2021
Jan. 25, 2020
Jan. 23, 2021
Jan. 25, 2020
Apr. 25, 2020
Segment Reporting Information [Line Items]          
Net sales $ 1,551,268 $ 1,456,155 $ 4,350,273 $ 4,203,550  
Operating income (loss) 61,681 43,816 173,259 42,344  
Total assets 2,850,965   2,850,965   $ 2,715,350
Consumable          
Segment Reporting Information [Line Items]          
Net sales 1,199,102 1,090,891 3,485,669 3,313,556  
Equipment and software          
Segment Reporting Information [Line Items]          
Net sales 266,519 273,329 616,077 621,652  
Value-added services and other          
Segment Reporting Information [Line Items]          
Net sales 85,647 91,935 248,527 268,342  
Dental          
Segment Reporting Information [Line Items]          
Net sales 648,946 626,589 1,710,989 1,692,328  
Dental | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income (loss) 61,291 48,822 172,017 135,458  
Total assets 865,383   865,383   704,216
Dental | Consumable          
Segment Reporting Information [Line Items]          
Net sales 342,561 301,599 957,013 909,638  
Dental | Equipment and software          
Segment Reporting Information [Line Items]          
Net sales 237,096 252,874 548,194 566,750  
Dental | Value-added services and other          
Segment Reporting Information [Line Items]          
Net sales 69,289 72,116 205,782 215,940  
Animal Health          
Segment Reporting Information [Line Items]          
Net sales 894,347 817,285 2,620,677 2,483,012  
Animal Health | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income (loss) 20,615 13,438 55,605 51,236  
Total assets 1,471,699   1,471,699   1,485,284
Animal Health | Consumable          
Segment Reporting Information [Line Items]          
Net sales 856,541 789,292 2,528,656 2,403,918  
Animal Health | Equipment and software          
Segment Reporting Information [Line Items]          
Net sales 29,423 20,455 67,883 54,902  
Animal Health | Value-added services and other          
Segment Reporting Information [Line Items]          
Net sales 8,383 7,538 24,138 24,192  
Corporate          
Segment Reporting Information [Line Items]          
Net sales 7,975 12,281 18,607 28,210  
Corporate | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income (loss) (20,225) (18,444) (54,363) (144,350)  
Total assets 513,883   513,883   $ 525,850
Corporate | Value-added services and other          
Segment Reporting Information [Line Items]          
Net sales 7,975 12,281 18,607 28,210  
United States          
Segment Reporting Information [Line Items]          
Net sales 1,272,696 1,217,291 3,586,674 3,491,053  
United States | Dental          
Segment Reporting Information [Line Items]          
Net sales 584,868 570,639 1,553,097 1,528,422  
United States | Animal Health          
Segment Reporting Information [Line Items]          
Net sales 679,853 634,371 2,014,970 1,934,421  
United States | Corporate          
Segment Reporting Information [Line Items]          
Net sales 7,975 12,281 18,607 28,210  
United Kingdom          
Segment Reporting Information [Line Items]          
Net sales 178,260 152,367 507,347 455,185  
United Kingdom | Animal Health          
Segment Reporting Information [Line Items]          
Net sales 178,260 152,367 507,347 455,185  
Canada          
Segment Reporting Information [Line Items]          
Net sales 100,312 86,497 256,252 257,312  
Canada | Dental          
Segment Reporting Information [Line Items]          
Net sales 64,078 55,950 157,892 163,906  
Canada | Animal Health          
Segment Reporting Information [Line Items]          
Net sales $ 36,234 $ 30,547 $ 98,360 $ 93,406