Accrued Insurance Claims (Details) (USD $)	Apr. 26, 2014	Jul. 27, 2013
Accrued Insurance Claims [Line Items]
Aggregate stop loss coverage for automobile liability, general liability and workers' compensation claims	$ 56,300,000
Insurance liability, annual retained risk loss	250,000
Retained risk of loss per participant for employee health plan for claim amounts that aggregate across all participants in excess of $250,000	550,000
Health plan participant threshold	250,000
Accrued Insurance, Claims	64,600,000	56,300,000
Accrued Insurance, Claims, Noncurrent	32,027,000	27,250,000
Maximum
Accrued Insurance Claims [Line Items]
Retained risk of loss, general liability and workers' compensation, maximum automobile liability	$ 1,000,000