Income Per Share - Computation of Earnings Per Common Share and Fully Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Basic Earnings Per Share:
Income From Continuing Operations	$ 0.4	$ 1.8	$ 0.2	$ 7.0
Income (loss) from discontinued operations	0.0	0.0	0.9	(0.6)
Net (Loss) Income	$ 0.4	$ 1.8	$ 1.1	$ 6.4
Weighted Average Number of Shares Outstanding, Including Participating Shares, Basic	45.2	46.4	45.7	46.3
Income from continuing operations income per common share - basic	$ 0.01	$ 0.04	$ 0.00	$ 0.15
Income (loss) from discontinued operations per common share - basic	0.00	0.00	0.02	(0.01)
Net income per common share - basic	$ 0.01	$ 0.04	$ 0.02	$ 0.14
Diluted Earnings Per Share:
Income From Continuing Operations	$ 0.4	$ 1.8	$ 0.2	$ 7.0
Income (loss) from discontinued operations	0.0	0.0	0.9	(0.6)
Net (Loss) Income	$ 0.4	$ 1.8	$ 1.1	$ 6.4
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0.6	0.5	0.5	0.6
Weighted-average common shares outstanding - assuming dilution	45.8	46.9	46.2	46.9
Income (loss) from discontinued operations per common share - assuming dilution	$ 0.00	$ 0.00	$ 0.02	$ (0.01)
Net income per common share - assuming dilution	$ 0.01	$ 0.04	$ 0.02	$ 0.14