Debt (Details) (USD $)									0 Months Ended			0 Months Ended
	Jan. 25, 2014	Jul. 27, 2013	Jan. 25, 2014 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021	Jul. 27, 2013 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021	Dec. 12, 2012 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021	Jan. 25, 2014 Senior Loans Credit Agreement, December 3, 2012, Maturing December 2017	Jul. 27, 2013 Senior Loans Credit Agreement, December 3, 2012, Maturing December 2017	Dec. 03, 2012 Senior Loans Credit Agreement, December 3, 2012, Maturing December 2017	Jan. 25, 2014 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017	Jul. 27, 2013 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017	Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017	Jan. 25, 2014 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Standby Letters of Credit	Jul. 27, 2013 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Standby Letters of Credit	Jul. 27, 2013 Revolving Credit Facility Prior Credit Agreement Which Has Been Terminated or Replaced	Jul. 27, 2013 Revolving Credit Facility Prior Credit Agreement Which Has Been Terminated or Replaced Standby Letters of Credit	Jan. 25, 2014 Debt Premium 7.125% Senior Subordinated Notes Due 2021	Jul. 27, 2013 Debt Premium 7.125% Senior Subordinated Notes Due 2021
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 425,676,000	$ 451,982,000	$ 277,500,000	$ 277,500,000		$ 118,750,000	$ 121,875,000		$ 26,000,000	$ 49,000,000						$ 280,900,000	$ 281,100,000
Debt, interest rate (in percent)			0.00%	7.125%
Debt premium	3,400,000	3,600,000	3,426,000	3,607,000	3,800,000
Long-term debt, fair value			298,700,000	292,400,000
Credit facility amount								125,000,000
Line of credit current borrowing capacity											275,000,000
Debt Instrument, Interest Rate at Period End						2.16%	2.19%		2.16%	2.19%
Letters of credit outstanding amount												49,700,000			46,700,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage									0.35%	0.35%		2.00%	2.00%
Additional borrowing availability									$ 199,300,000					$ 179,300,000