Earnings Per Share and Stock Issuances - Common Stock Activity (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Stock Options And Restricted Stock Units
Employee Stock Purchase Plan [Line Items]
Shares issued, net of shares withheld for taxes, under stock option, RSUs, LTPP and employee stock purchase plans	0.0	0.1	0.6	0.6
Shares issued in connection with RB Foods acquisition	6.4	0.0	6.4	0.0
Share Repurchase Program
Employee Stock Purchase Plan [Line Items]
Shares repurchased under the stock repurchase program	0.0	0.8	1.4	1.9