Restructuring Activities (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 27, 2012	May 29, 2011	May 30, 2010
Acquisition-related restructuring [Member]
Liabilities for various initiatives and changes
Costs incurred and charged to expense	$ 4.3
Balance at May 27, 2012	4.3
Administrative efficiency restructuring plan [Member]
Liabilities for various initiatives and changes
Costs incurred and charged to expense	16.3
Costs Paid or Otherwise Settled	(13.1)
Changes in estimates	(0.8)
Balance at May 27, 2012	2.4
Network optimization plan [Member]
Liabilities for various initiatives and changes
Balance at May 29, 2011	4.8
Costs incurred and charged to expense	11.3
Costs Paid or Otherwise Settled	(8.9)
Changes in estimates	0.6
Balance at May 27, 2012	7.8
2010 plan [Member]
Liabilities for various initiatives and changes
Costs incurred and charged to expense	2.6	25.7	39.2
Severance and related costs [Member] | Acquisition-related restructuring [Member]
Liabilities for various initiatives and changes
Costs incurred and charged to expense	4.3
Balance at May 27, 2012	4.3
Severance and related costs [Member] | Administrative efficiency restructuring plan [Member]
Liabilities for various initiatives and changes
Costs incurred and charged to expense	9.2
Costs Paid or Otherwise Settled	(6.3)
Changes in estimates	(0.8)
Balance at May 27, 2012	2.1
Severance and related costs [Member] | Network optimization plan [Member]
Liabilities for various initiatives and changes
Balance at May 29, 2011	4.8
Costs incurred and charged to expense	3.8
Costs Paid or Otherwise Settled	(2.2)
Changes in estimates	0.6
Balance at May 27, 2012	7.0
Plan implementation costs [Member] | Administrative efficiency restructuring plan [Member]
Liabilities for various initiatives and changes
Costs incurred and charged to expense	7.1
Costs Paid or Otherwise Settled	(6.8)
Balance at May 27, 2012	0.3
Plan implementation costs [Member] | Network optimization plan [Member]
Liabilities for various initiatives and changes
Costs incurred and charged to expense	7.5
Costs Paid or Otherwise Settled	(6.7)
Balance at May 27, 2012	$ 0.8