Related Parties (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
EMC Corporation [Member]
Related Party Transaction [Line Items]
Purchases from related parties	$ 6.9	$ 4.7	$ 6.5
Staples, Inc. [Member]
Related Party Transaction [Line Items]
Purchases from related parties	$ 1.7	$ 1.3	$ 1.6