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Other Financial Data (Details) - Schedule of Other Financial Data Other Than Accumulated Other Comprehensive Income - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Schedule of Other Financial Data Other Than Accumulated Other Comprehensive Income [Abstract]      
Advertising expense $ 129.7 $ 123.4 $ 135.8
Prepublication and production costs 51.7 57.4 61.5
Amortization of prepublication and production costs 30.4 32.9 26.6
Foreign currency transaction gain (loss) 0.1 (1.0) (0.5)
Purchases related to contractual commitments for minimum print quantities $ 0.0 $ 0.0 $ 0.0