Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended	0 Months Ended	3 Months Ended
	Jun. 29, 2014 item	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013	Dec. 31, 2013	Jul. 01, 2014 item	Sep. 29, 2014 item	Dec. 31, 2011 sqft
Commitments and contingencies
Contract obligation expense	$ 4,779		$ 5,090		$ 3,381
Net sales	49,633	64,212	99,713	128,061
Gross profit	4,993	18,382	14,687	37,119
Accrued contract obligation expenses	2,411		2,411		1,194
Other long-term liabilities	3,139		3,139		2,230
Deferred income	17,867		17,867		19,467
Reduction of salaried employees	24
Reduction of hourly employees	64
Severance expenses	382
Area of lease facility with Osceola County in Florida (in square feet)								16,000
Contributed amount of funds to the County to assist with the cost of the renovations			250
Minimum capital investment	2,500		2,500
Capital investment in lease			181		181
Lease term			12 years
Lease payments due for the initial five years	0		0
Lease initial specific period			5 years
Lease annual cost			108
Lease annual charge accounted under straight-line basis			78
Deferred lease expense	75		75		36
Accrued contractual penalty	75		75		50
Subsequent event
Commitments and contingencies
Reduction of salaried employees						9	9
Severance expenses							164
M240 Program
Commitments and contingencies
Incremental contract obligation expense	4,779
Incremental contract obligation expense related to inventory reserves	1,997
Incremental contract obligation expense excluding inventory reserves	2,782
Inventory reserves	1,619		1,619		639
Accrued contract obligation expenses	3,550		3,550		1,194
Other long-term liabilities	1,139		1,139		0
Deferred income	6,820		6,820		6,820
Term to retrofit previously delivered units			12 months
M249 contract
Commitments and contingencies
No-Cost Cancellation expense	480
No-Cost Cancellation expense related to inventory write-off	344
No-Cost Cancellation expense related to accruals for other liabilities	136
Adjustments
Commitments and contingencies
Net sales		(23)		(23)
Gross profit		(88)		(102)
Previously reported
Commitments and contingencies
Net sales		64,235		128,084
Gross profit		18,470		37,221
Previously reported | M240 Program
Commitments and contingencies
Inventory reserves					206
M240 Program - contract modification and contract obligation expense | Adjustments
Commitments and contingencies
Net sales					(6,820)
Gross profit					(10,201)
Capital expenditures for machinery and equipment
Commitments and contingencies
Unconditional purchase obligations	981		981		892
Standby letters of credit | Secured by restricted cash
Commitments and contingencies
Standby letters of credit	1,181		1,181		1,185
Standby letters of credit | Secured by Credit Agreement
Commitments and contingencies
Standby letters of credit	3,906		3,906		3,486
Standby letters of credit | Established by a sales agent on behalf of Colt
Commitments and contingencies
Standby letters of credit	74		74		74
Industrial Cooperation Agreements
Commitments and contingencies
Remaining gross offset purchase commitments	64,937		64,937		64,131
Remaining net offset purchase commitments, accrual amount	$ 1,648		$ 1,648		$ 1,639