Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.7.0.1
Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Commitments and Contingencies [Abstract]      
Rent expense $ 39.7 $ 39.8 $ 39.4
Minimum future payment obligations under purchase orders and legally binding contractual arrangements 127.4 $ 109.6  
Commitments to purchase capital assets $ 7.4