Debt Issuance - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended		6 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended
	Mar. 25, 2013	Sep. 25, 2012	Oct. 26, 2013	Oct. 27, 2012	Oct. 26, 2013	Jul. 26, 2013 National Veterinary Supply acquisition	Oct. 26, 2013 National Veterinary Supply acquisition
Debt Disclosure [Line Items]
Repayment of term loan	$ 50,000	$ 75,000		$ 75,000
Debt instrument, maturity date					Mar. 20, 2013
Proceeds from revolving line of credit			$ 135,000			$ 135,000
Date of acquisition							Aug. 16, 2013