Income Tax	6 Months Ended
Nov. 30, 2015
Income Tax Disclosure [Abstract]
Income Tax	INCOME TAX Our effective income tax rates were 24.7% and 25.8% for the three months ended November 30, 2015 and November 30, 2014, respectively. Our effective income tax rates were 25.4% and 26.1% for the six months ended November 30, 2015 and November 30, 2014, respectively. Our effective income tax rates differ from the U.S. statutory rate primarily due to income generated in international jurisdictions with lower income tax rates. We conduct business globally and file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. In the normal course of business, we are subject to examination by taxing authorities around the world, including, without limitation, the United States, the United Kingdom and Canada. We are no longer subject to state income tax examinations for years ended on or before May 31, 2008 and are no longer subject to U.S. federal income tax examinations for fiscal years prior to 2012 and U.K. federal income tax examinations for years ended on or before May 31, 2013, and Canada federal income tax examinations for years ended on or before May 31, 2012.

Income Tax

6 Months Ended

Nov. 30, 2015

INCOME TAX

Our effective income tax rates were 24.7% and 25.8% for the three months ended November 30, 2015 and November 30, 2014, respectively. Our effective income tax rates were 25.4% and 26.1% for the six months ended November 30, 2015 and November 30, 2014, respectively. Our effective income tax rates differ from the U.S. statutory rate primarily due to income generated in international jurisdictions with lower income tax rates.

We conduct business globally and file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. In the normal course of business, we are subject to examination by taxing authorities around the world, including, without limitation, the United States, the United Kingdom and Canada. We are no longer subject to state income tax examinations for years ended on or before May 31, 2008 and are no longer subject to U.S. federal income tax examinations for fiscal years prior to 2012 and U.K. federal income tax examinations for years ended on or before May 31, 2013, and Canada federal income tax examinations for years ended on or before May 31, 2012.