Earnings Per Share - Reconciliation from Basic Earnings Per Share to Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Determination of shares:
Weighted average common shares outstanding (in shares)	864.9	889.4
Assumed conversion of dilutive stock options and awards (in shares)	21.3	21.3
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (in shares)	886.2	910.7
Basic earnings per common share for NIKE, Inc. (in dollars per share)	$ 1.11	$ 0.88
Diluted earnings per common share for NIKE, Inc. (in dollars per share)	$ 1.09	$ 0.86