Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Loss Contingencies [Line Items]
Operating Leases, Noncancelable Payments in Excess of One Year	$ 15,300,000	$ 10,600,000	$ 9,400,000
Operating Leases, Rent Expense	19,000,000	9,900,000	6,700,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future minimum payments due 2014	13,447,000
Future minimum payments due 2015	9,301,000
Future minimum payments due 2016	6,084,000
Future minimum payments due 2017	3,105,000
Future minimum payments due 2018	1,482,000
Future minimum payments due thereafter	1,198,000
Operating Leases, Future Minimum Payments Due	34,617,000
Credit Agreement, December 3, 2012, Maturing December 2017 | Revolving Credit Facility | Standby Letters of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding amount	46,700,000
Prior Credit Agreement Which Has Been Terminated or Replaced | Revolving Credit Facility | Standby Letters of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding amount		38,500,000
Performance Guarantee and Surety Bond
Loss Contingencies [Line Items]
Outstanding performance and other surety contract bonds	$ 446,500,000