Income Taxes (Details) (USD $)	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Apr. 30, 2011 TaxAdjustments	Jul. 30, 2011	Apr. 30, 2011 Fiscal Years 2004 and 2005 IRS Examination [Member] TaxAdjustments	Jul. 30, 2011 Fiscal Years 2004 and 2005 IRS Examination [Member] TaxAdjustments	Jan. 02, 2008 Fiscal Years 2004 and 2005 IRS Examination [Member] TaxAdjustments TaxAdjustmentsYears	Apr. 30, 2011 Fiscal Years 2006 and 2007 IRS Examination [Member] TaxAdjustments	Jul. 30, 2011 Fiscal Years 2006 and 2007 IRS Examination [Member]	Aug. 01, 2009 Fiscal Years 2006 and 2007 IRS Examination [Member] TaxAdjustments
Summary of changes in the total amounts of uncertain tax positions
Uncertain tax positions, Beginning Balance		$ 18,447,000
Additions based on tax positions related to the prior year		9,265,000
Reductions for tax positions related to prior years		(17,677,000)
Settlements with taxing authorities		(370,000)
Uncertain tax positions, Ending Balance		9,665,000
Income Taxes (Textuals) [Abstract]
Income tax examination, number of adjustments proposed by IRS					4			4
Income tax examination, number of fiscal years that adjustments were proposed for					2
Income tax examination, number of one time issues unresolved				2
Total tax liability				46,000,000			195,000,000
Income tax examination, number of settlements reached with IRS			3			3
Income tax examination, number of same settlements reached with IRS for periods one and two	2
Potential liability related to IRS adjustment				36,500,000			157,500,000
Income tax examination, amount of tax due for transfer pricing issue							0
Net tax benefit recorded		$ 10,800,000