Earnings Per Share - Reconciliation from Basic Earnings Per Share to Diluted Earnings Per Share (Detail) - $ / shares shares in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Determination of shares:
Weighted average common shares outstanding (in shares)	861.7	883.4	897.3
Assumed conversion of dilutive stock options and awards (in shares)	22.7	22.4	19.1
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (in shares)	884.4	905.8	916.4
Earnings per common share from continuing operations:
Basic (in dollars per share)	$ 3.80	$ 3.05	$ 2.74
Diluted (in dollars per share)	3.70	2.97	2.68
Earnings per common share from discontinued operations:
Basic (in dollars per share)	0.00	0.00	0.02
Diluted (in dollars per share)	0.00	0.00	0.02
Basic earnings per common share for NIKE, Inc. (in dollars per share)	3.80	3.05	2.76
Diluted earnings per common share for NIKE, Inc. (in dollars per share)	$ 3.70	$ 2.97	$ 2.70