Goodwill, Net Intangibles and Deferred Charges and Other Noncurrent Assets (Intangibles) (Details) - USD ($) $ in Thousands	Oct. 04, 2015	Mar. 31, 2015
Amortizing assets
Gross Carrying Amount	$ 199,312	$ 198,994
Accumulated Amortization	(60,028)	(33,787)
Net Intangibles	139,284	165,207
Expected future amortization expense
Remainder of 2015	13,133
Fiscal 2016	51,015
Fiscal 2017	50,509
Fiscal 2018	11,956
Fiscal 2019	6,403
Thereafter	6,268
Net Intangibles	139,284	165,207
Contract backlog
Amortizing assets
Gross Carrying Amount	164,000	164,000
Accumulated Amortization	(30,833)	(6,167)
Net Intangibles	133,167	157,833
Expected future amortization expense
Remainder of 2015	12,333
Fiscal 2016	49,333
Fiscal 2017	49,333
Fiscal 2018	10,833
Fiscal 2019	5,335
Thereafter	6,000
Net Intangibles	133,167	157,833
Patented technology
Amortizing assets
Gross Carrying Amount	11,018	10,700
Accumulated Amortization	(5,913)	(5,350)
Net Intangibles	5,105	5,350
Expected future amortization expense
Net Intangibles	5,105	5,350
Customer relationships and other
Amortizing assets
Gross Carrying Amount	24,294	24,294
Accumulated Amortization	(23,282)	(22,270)
Net Intangibles	1,012	2,024
Expected future amortization expense
Net Intangibles	1,012	$ 2,024
Patents and Customer Relationships
Amortizing assets
Net Intangibles	6,117
Expected future amortization expense
Remainder of 2015	800
Fiscal 2016	1,682
Fiscal 2017	1,176
Fiscal 2018	1,123
Fiscal 2019	1,068
Thereafter	268
Net Intangibles	$ 6,117