Balance Sheet Accounts and Supplemental Disclosures, (As Restated for fiscal 2014 and 2013) - Schedule of Inventories (Details) - USD ($) $ in Millions	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Long-term contracts at average cost	$ 505.8				$ 493.6
Progress payments	(349.6)				(356.9)
Total long-term contract inventories	156.2				136.7
Total other inventories	1.3				1.3
Inventories	$ 157.5	$ 147.9	$ 150.1	$ 161.5	$ 138.0	$ 131.8	$ 131.7	$ 136.2