Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 25, 2012	Aug. 27, 2011	Aug. 28, 2010
Operating Loss Carryforwards [Line Items]
Federal statutory tax rate	35.00%	35.00%	35.00%
Deferred taxes are not provided for temporary differences	$ 195.8	$ 140.2
Deferred tax assets from federal tax operating losses	7.8	8.0
Deferred tax assets from state tax NOLs	2.1	1.1
Deferred tax assets from non-U.S. NOLs	2.4	1.5
Expiration date of federal state and non-U.S. NOLs	Between fiscal 2013 and 2031
Valuation allowance from certain federal and state NOLs	9.1	8.0
Deferred tax assets from federal state and Non-U.S. income tax carryforwards	24.3	21.2
Expiration date of tax credit carryforwards	Fiscal 2013 through fiscal 2026
Tax credit carryforward, valuation allowances	0.4
Unrecognized tax benefits , if recognized would reduce effective tax rate, amount	18.1
Accrued for payment of interest and penalties associated with unrecognized tax benefits	4.1	5.2
Amount of unrecognized tax benefits that could be reduce over next twelve months	6.0
Federal tax [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	22.2	22.8
State tax [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	46.6	22.5
Non-U.S. [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 7.7	$ 5.1