Restatement - Summary of the Impact to Pretax Income (Loss) from Continuing Operations by Reporting Period (Footnote) (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)	Feb. 28, 2015 USD ($) $ / shares	Aug. 31, 2015 USD ($) contract_amendment contract $ / shares	Nov. 30, 2014 USD ($) $ / shares	Nov. 30, 2013 USD ($) $ / shares
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss) | $	$ 7.0	$ 5.1	$ (3.3)
Net loss per share (in USD per share) | $ / shares			$ (0.06)
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss) | $			$ 0.6	$ (0.3)	$ 3.0	$ (5.0)
Net loss per share (in USD per share) | $ / shares			$ 0.01	$ 0.00	$ 0.06	$ 0.06
Rocketdyne Business [Member] | Purchase Accounting [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of contracts acquired | contract				3
Rocketdyne Business [Member] | Contract Accounting [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of contract amendments | contract_amendment				1