Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Jan. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Balances and Related Activity by Business Segment
Goodwill balances and related activity by business segment are as follows:
 
Balance at
April 25,
2015
 
Acquisition
Activity and
Divestitures
 
Other Activity
 
Balance at
January 30,
2016
Corporate
$
—

 
$
—

 
$
—

 
$
—

Dental
139,449

 
—

 
(1,381
)
 
138,068

Animal Health
160,475

 
518,370

 
(1,597
)
 
677,248

Total
$
299,924

 
$
518,370

 
$
(2,978
)
 
$
815,316
Balances of Other Intangible Assets Excluding Goodwill
Balances of other intangible assets, excluding goodwill, are as follows:
 
January 30,
2016
 
April 25,
2015
Unamortized – indefinite lived:
 
 
 
Copyrights, trade names and trademarks
$
29,900

 
$
17,600

Amortized:
 
 
 
Distribution agreement, customer lists and other
638,854

 
221,359

Less: Accumulated amortization
(146,539
)
 
(113,934
)
Net amortized intangible assets
492,315

 
107,425

Total identifiable intangible assets, net
$
522,215

 
$
125,025