Notes Payable - Schedule of Notes Payable (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jun. 24, 2009
Notes Due June 2012 [Member]
Debt Instrument [Line Items]
Debt instrument face value	$ 1.2	$ 1.2
Debt Instruments Maturity Period	2012
Debt instrument stated interest rate percentage		0.76%
Percentage of interest acquired		49.00%
Secured Term Loan Due September 2015 [Member]
Debt Instrument [Line Items]
Debt instrument face value	11.0
Debt Instruments Maturity Period	2015
Debt instrument stated interest rate percentage	5.60%
Debt instrument periodic payment	0.1
Reduction in the final balloon payment	$ 6.4