Balance Sheet Accounts and Supplemental Disclosures, (As Restated for fiscal 2014 and 2013) - Summary of Impact of Land Sale (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2015	Aug. 31, 2014	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax provision related to land sale															$ 1.1
Net income from land sale	$ 0.1	$ 0.6	$ 0.0	$ 0.2	$ (0.1)	$ 0.2	$ (0.8)	$ 0.0	$ 0.2	$ (0.8)	$ 0.8	$ (0.6)	$ 0.9	$ (0.7)	$ 0.2
Hillsborough [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales from land sale													42.0
Cost of sales from land sale													11.4
Income from continuing operations before income taxes from land sale													30.6
Income tax provision related to land sale													12.7
Net income from land sale													$ 17.9