Line of Credit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Jan. 02, 2015	May. 07, 2014	Jul. 31, 2013
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 125.0	$ 90.0	$ 75.0
Commitment increase		50.0		$ 25.0
Maximum borrowing capacity increase		$ 35.0	$ 15.0
Allowable issuance amount of letters of credit	$ 10.0
Letters of credit outstanding	$ 0.0
Credit agreement, final maturity date	Jul. 31, 2017
Line of credit facility, maximum borrowing capacity, available	$ 69.0
Percentage of annual commitment fee on unused capacity	0.20%
Ratio of EBITDA plus stock compensation and minus income taxes paid and capital expenditures to interest expense and scheduled payments due for borrowings	2.00
Ratio of current maturities of long-term debt to EBITDA plus stock compensation and minus income taxes paid and capital expenditures	2.75
Prime Rate [Member]
Line of Credit Facility [Line Items]
Interest rate at period end	4.25%
Prime Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Margin interest rate percentage	0.00%
Prime Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Margin interest rate percentage	0.50%
LIBOR [Member]
Line of Credit Facility [Line Items]
Interest rate at period end	0.428%
LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Margin interest rate percentage	2.00%
LIBOR [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Margin interest rate percentage	2.50%