Treasury Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	0 Months Ended
	Apr. 30, 2012	Aug. 12, 2011 August 2011 Repurchase Agreement [Member]	Aug. 15, 2011 August 2011 Repurchase Agreement [Member]	Jan. 18, 2012 January 2012 Repurchase Agreement [Member]	Jan. 20, 2012 January 2012 Repurchase Agreement [Member]	Jan. 18, 2012 Catterton Repurchase Agreements [Member]	Jan. 20, 2012 Catterton Repurchase Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock purchased, shares			1,000,000		1,000,000		1,000,000
Common stock price per share			$ 20.00		$ 28.50		$ 28.50
Aggregate purchase price of common stock	$ 77,000		$ 20,000		$ 28,500		$ 28,500
Closing price of common stock		$ 20.62		$ 29.34		$ 29.34
Percentage of issued and outstanding common stock prior to repurchase			1.80%		1.80%		1.80%