Segment Reporting - Information about Reportable Segments (Detail) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
|
Jan. 30, 2016 |
Jan. 24, 2015 |
Jan. 30, 2016 |
Jan. 24, 2015 |
Apr. 25, 2015 |
| Segment Reporting Information [Line Items] |
|
|
|
|
|
| Net sales |
$ 1,400,853
|
$ 958,628
|
$ 3,932,933
|
$ 2,875,804
|
|
| Operating income (loss) from continuing operations |
95,729
|
77,377
|
241,369
|
215,513
|
|
| Total assets, excluding assets held for sale |
3,555,670
|
|
3,555,670
|
|
$ 2,193,565
|
| Assets held for sale |
0
|
|
0
|
|
754,141
|
| Total assets |
3,555,670
|
|
3,555,670
|
|
2,947,706
|
| Corporate [Member] |
|
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
|
| Total assets, excluding assets held for sale |
526,452
|
|
526,452
|
|
539,863
|
| Dental [Member] |
|
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
|
| Total assets, excluding assets held for sale |
935,347
|
|
935,347
|
|
1,022,257
|
| Animal Health [Member] |
|
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
|
| Total assets, excluding assets held for sale |
2,093,871
|
|
2,093,871
|
|
$ 631,445
|
| Operating Segments [Member] | Corporate [Member] |
|
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
|
| Net sales |
13,489
|
10,158
|
37,380
|
29,050
|
|
| Operating income (loss) from continuing operations |
(12,338)
|
(12,535)
|
(46,193)
|
(38,698)
|
|
| Operating Segments [Member] | Dental [Member] |
|
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
|
| Net sales |
637,651
|
610,655
|
1,814,090
|
1,746,165
|
|
| Operating income (loss) from continuing operations |
82,108
|
78,048
|
223,454
|
214,024
|
|
| Operating Segments [Member] | Animal Health [Member] |
|
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
|
| Net sales |
749,713
|
337,815
|
2,081,463
|
1,100,589
|
|
| Operating income (loss) from continuing operations |
$ 25,959
|
$ 11,864
|
$ 64,108
|
$ 40,187
|
|