Other Financial Data (Details) - Schedule of Other Financial Data Other Than Accumulated Other Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Schedule of Other Financial Data Other Than Accumulated Other Comprehensive Income [Abstract]
Advertising expense	$ 133.1	$ 146.4	$ 145.0
Prepublication and production costs	147.6	149.0	127.3
Amortization of prepublication and production costs	60.4	48.9	55.1
Foreign currency transaction gain (loss)	(1.0)	(0.5)	0.7
Purchases related to contractual commitments for minimum print quantities	$ 0	$ 0	$ 0