Debt (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended			0 Months Ended		0 Months Ended			3 Months Ended
	Jan. 02, 2014	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014 Standby Letters of Credit	Jan. 02, 2014 LIBOR	Jan. 02, 2014 Base Rate	Jan. 02, 2014 Federal Funds Rate	Oct. 24, 2014 First Amendment to the Credit Agreement Line of Credit	Jul. 23, 2014 First Amendment to the Credit Agreement Line of Credit	Jul. 25, 2014 Research and Development Investment Loan	Jul. 25, 2014 Research and Development Investment Loan Minimum
Line of Credit Facility [Line Items]
Revolving Credit Facility, Maximum Borrowing Capacity	$ 750,000
Revolving Credit Facility	750,000					12,123
Line of Credit Facility, Amount Outstanding	50,000	465,036		465,036
Accordion Option	1,050,000
Credit Facility Variable Rate Low End							0.00%	0.00%
Credit Facility Variable Rate High End							2.75%	1.75%
Debt Instrument, Basis Spread on Variable Rate							1.00%		0.50%
Credit Facility Unused Capacity Commitment Fee Percentage Low End Of Range	0.15%
Credit Facility Unused Capacity Commitment Fee Percentage High End Of Range	0.25%
Financing costs	2,064
Unamortized debt financing cost	760										1,279
Debt financing cost amortization period	5 years
Coverage ratio requirement										3.00
Leverage ratio requirement										4.50
Current coverage ratio										15.58
Current leverage ratio										3.81
Credit Agreement, Additional Indebtedness											300,000
Credit Agreement, Sale Leaseback Capacity											100,000
Credit Agreement, Additional Capacity, Mortgage Indebtedness											50,000
Effective interest rate		2.06%	1.46%	1.84%	1.46%
Impact of change in effective interest rate		4,715		4,715
Loans Payable												$ 3,000
Interest-free-loan period												7 years
Variable interest rate													2.00%