Contingencies (Details) - USD ($)			1 Months Ended	9 Months Ended
	Mar. 27, 2015	Jul. 30, 2013	Dec. 31, 2001	Dec. 31, 2015	Mar. 31, 2015
Business Acquisitions [Line Items]
Damages sought, value		$ 100,000,000
Damages paid, value	$ 25,000,000
Unbilled receivables for contract claims				$ 25,042,000	$ 42,055,000
Recorded third-party environmental recoveries, discount rate				0.70%	0.50%
Treasury constant maturities rate used to estimate discount rate (in years)				20 years
Estimated inflationary factor (as a percent)				1.90%
Environmental remediation
Amounts (payable) receivable				$ (41,824,000)	$ (51,749,000)
Unamortized discount				1,718,000	1,624,000
Accrual for Environmental Loss Contingencies, Net				(40,106,000)	(50,125,000)
Amounts (payable) receivable				18,236,000	26,506,000
Unamortized discount				(568,000)	(750,000)
Accrual for Environmental Loss Contingencies Net of Recoveries				17,668,000	25,756,000
Discounted liability recorded in other current liabilities				5,006,000
Discounted liability recorded in other long-term liabilities				35,100,000	$ 43,326,000
Discounted receivable recorded in other current assets				2,523,000
Discounted receivable recorded in other non-current assets				15,145,000
Threshold for Hercules to indemnify the Company for environmental remediation				$ 50,000
Utah state estimated damages			$ 139,000,000
Rounding precision of estimated inflationary factor (as a percent)				0.25%
Aggregate undiscounted amounts payable for environmental remediation costs, net of expected recoveries
2016				$ 2,484,000
2017				297,000
2018				283,000
2019				2,354,000
2020				1,842,000
Thereafter				16,328,000
Total				23,588,000
Minimum
Environmental remediation
Estimated discounted reasonably possible costs of environmental remediation				40,106,000
Maximum
Environmental remediation
Estimated discounted reasonably possible costs of environmental remediation				78,920,000
Thiokol | Environmental Remediation Cost Sharing Level 1 | Maximum
Environmental remediation
Threshold for environmental remediation if costs are not recovered through U.S. Government contracts				14,000,000
Thiokol | Environmental Remediation Cost Sharing Level 2 | Minimum
Environmental remediation
Threshold for environmental remediation if costs are not recovered through U.S. Government contracts				14,000,000
Thiokol | Environmental Remediation Cost Sharing Level 2 | Maximum
Environmental remediation
Threshold for environmental remediation if costs are not recovered through U.S. Government contracts				34,000,000
Thiokol | Environmental Remediation Cost Sharing Level 3 | Minimum
Environmental remediation
Threshold for environmental remediation if costs are not recovered through U.S. Government contracts				$ 34,000,000