Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 28, 2014	May 24, 2013	May 25, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (4.2)
Other comprehensive income (loss) before reclassifications		(1.4)
Amounts reclassified from accumulated other comprehensive income		(0.9)
Net current period other comprehensive income (loss)	(2.3)	(2.3)	(16.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(6.5)
Unrealized gain on investments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		0.6
Other comprehensive income (loss) before reclassifications		0.1
Amounts reclassified from accumulated other comprehensive income		0.1
Net current period other comprehensive income (loss)	0.2
Accumulated Other Comprehensive Income (Loss), Net of Tax		0.8
Minimum pension liability [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		18.9
Other comprehensive income (loss) before reclassifications		0
Amounts reclassified from accumulated other comprehensive income		(1.0)
Net current period other comprehensive income (loss)	(1.0)
Accumulated Other Comprehensive Income (Loss), Net of Tax		17.9
Derivative adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(0.1)
Other comprehensive income (loss) before reclassifications		0
Amounts reclassified from accumulated other comprehensive income		0
Net current period other comprehensive income (loss)	0
Accumulated Other Comprehensive Income (Loss), Net of Tax		(0.1)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(23.6)
Other comprehensive income (loss) before reclassifications		(1.5)
Amounts reclassified from accumulated other comprehensive income		0
Net current period other comprehensive income (loss)	(1.5)
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (25.1)