Balance Sheet Accounts and Supplemental Disclosures, (As Restated for fiscal 2014 and 2013) - Schedule of Other Current Assets, net (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
Other Current Assets [Line Items]
Prepaid expenses	$ 10.7				$ 11.3
Receivables, net	7.2				5.6
Indemnification receivable from UTC, net	171.5	$ 189.3	$ 175.6	$ 190.0	170.5	$ 200.5	$ 177.3	$ 186.1
Recoverable from the U.S. government for Competitive Improvement Program severance obligations	9.5				0.0
Other	6.5				10.3
Other current assets, net	61.5	$ 63.3	$ 49.0	$ 43.7	38.6	$ 30.1	$ 24.5	$ 28.6
UTC [Member]
Other Current Assets [Line Items]
Indemnification receivable from UTC, net	15.7				0.9
Business Integration Costs [Member]
Other Current Assets [Line Items]
Recoverable from the U.S. government for Rocketdyne Business integration costs	$ 11.9				$ 10.5