Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.8.0.1
Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
Feb. 28, 2018
May 31, 2017
Commitments and Contingencies [Abstract]    
Commitments to purchase capital assets $ 5.8 $ 7.4