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Sales Information by Product (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Apr. 28, 2012
Jan. 28, 2012
Oct. 29, 2011
Jul. 30, 2011
Apr. 30, 2011
Jan. 29, 2011
Oct. 30, 2010
Jul. 31, 2010
Apr. 28, 2012
Apr. 30, 2011
Apr. 24, 2010
Segment Reporting Information [Line Items]                      
Net sales $ 936,334 $ 895,030 $ 856,875 $ 847,422 $ 883,819 $ 824,650 $ 857,414 $ 849,787 $ 3,535,661 $ 3,415,670 $ 3,237,376
Consumable and printed products
                     
Segment Reporting Information [Line Items]                      
Net sales                 2,312,309 2,232,876 2,124,558
Equipment and software
                     
Segment Reporting Information [Line Items]                      
Net sales                 930,601 900,846 839,436
Other
                     
Segment Reporting Information [Line Items]                      
Net sales                 292,751 281,948 273,382
Dental Supply
                     
Segment Reporting Information [Line Items]                      
Net sales                 2,287,875 2,236,056 2,167,495
Dental Supply | Consumable and printed products
                     
Segment Reporting Information [Line Items]                      
Net sales                 1,263,515 1,253,224 1,214,796
Dental Supply | Equipment and software
                     
Segment Reporting Information [Line Items]                      
Net sales                 768,633 734,749 709,468
Dental Supply | Other
                     
Segment Reporting Information [Line Items]                      
Net sales                 255,727 248,083 243,231
Rehabilitation Supply
                     
Segment Reporting Information [Line Items]                      
Net sales                 513,340 504,734 426,297
Rehabilitation Supply | Consumable and printed products
                     
Segment Reporting Information [Line Items]                      
Net sales                 363,003 348,641 303,044
Rehabilitation Supply | Equipment and software
                     
Segment Reporting Information [Line Items]                      
Net sales                 123,650 131,776 100,583
Rehabilitation Supply | Other
                     
Segment Reporting Information [Line Items]                      
Net sales                 26,687 24,317 22,670
Veterinary Supply
                     
Segment Reporting Information [Line Items]                      
Net sales                 734,446 674,880 643,584
Veterinary Supply | Consumable and printed products
                     
Segment Reporting Information [Line Items]                      
Net sales                 685,790 631,011 606,718
Veterinary Supply | Equipment and software
                     
Segment Reporting Information [Line Items]                      
Net sales                 38,319 34,321 29,385
Veterinary Supply | Other
                     
Segment Reporting Information [Line Items]                      
Net sales                 $ 10,337 $ 9,548 $ 7,481