Liability for Initiatives and Changes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
	May 27, 2012	Aug. 26, 2012 Acquisition-related restructuring	Aug. 26, 2012 Administrative Efficiency Restructuring Plan	Aug. 26, 2012 Network Optimization Plan	Aug. 26, 2012 Severance and related costs Acquisition-related restructuring	Aug. 26, 2012 Severance and related costs Administrative Efficiency Restructuring Plan	Aug. 26, 2012 Severance and related costs Network Optimization Plan	Aug. 26, 2012 Plan implementation costs Administrative Efficiency Restructuring Plan	Aug. 26, 2012 Plan implementation costs Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Balance at May 27, 2012		$ 4.3	$ 2.4	$ 7.8	$ 4.3	$ 2.1	$ 7.0	$ 0.3	$ 0.8
Costs Incurred and Charged to Expense	2.6	1.6	0.4	1.8	1.6	0.4			1.8
Costs Paid or Otherwise Settled		(1.6)	(1.3)	(5.1)	(1.6)	(1.0)	(3.1)	(0.3)	(2.0)
Changes in Estimates		0.3	0.1	(0.3)	0.3	0.1	(0.3)
Balance at August 26, 2012		$ 4.6	$ 1.6	$ 4.2	$ 4.6	$ 1.6	$ 3.6		$ 0.6