Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

v3.3.1.900
Income Taxes (Details)
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Income Tax Disclosure [Abstract]        
Effective tax rate 19.50% 54.60% 5.40% 32.70%