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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, 2017
May 31, 2016
May 31, 2015
Schedule of Other Financial Data Other Than Accumulated Other Comprehensive Income [Abstract]      
Advertising expense $ 121.0 $ 127.3 $ 129.7
Amortization of prepublication and production costs 23.3 26.4 30.4
Foreign currency transaction gain (loss) 1.0 (0.5) 0.1
Purchases related to contractual commitments for minimum print quantities $ 0.0 $ 0.0 $ 0.0