Condensed Consolidating Schedules - Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016	Jan. 01, 2017
Condensed Financial Statements, Captions [Line Items]
Capital lease obligations, less current portion	$ 13,304		$ 13,304		$ 13,602
Capital lease obligations, current portion	549		549		467
Transaction and severance costs	490	$ 434	570	$ 1,184
Cash flows provided by (used in) operating activities:
Net Cash Provided by (Used in) Operating Activities			76,755	77,738
Cash flows provided by (used in) investing activities:
Proceeds from sale of property and equipment			(47,045)	(42,400)
Proceeds from Sale of Property, Plant, and Equipment			237	318
Payments to Develop Software			(2,075)	(6,223)
Net cash used in investing activities			(48,883)	(48,305)
Repayments on senior term loan			(3,800)	(3,800)
Repayments of Notes Payable			(13)	(24)
Cash flows from financing activities:
Repayments on note payable				(24)
Proceeds from sale leaseback transaction			4,073	0
Repayments of Long-term Capital Lease Obligations			(218)	(204)
Sale Leaseback Transaction, Payments, Financing Activities			(1,161)	(956)
Excess tax benefit realized from stock-based compensation			0	4
Adjustments to Additional Paid in Capital, Other			(1,447)	0
Net cash provided by (used in) financing activities			328	(4,980)
Effect of foreign exchange rate changes on cash			239	484
Change in cash and cash equivalents			28,439	24,937
Cash and cash equivalents at beginning of period			61,023	50,654
Cash and cash equivalents at end of period	89,462	75,591	89,462	75,591
Guarantors
Condensed Financial Statements, Captions [Line Items]
Capital lease obligations, less current portion	0		0		0
Capital lease obligations, current portion	0		0		0
Transaction and severance costs	0	7	0	55
Cash flows provided by (used in) operating activities:
Net Cash Provided by (Used in) Operating Activities			20,594	11,899
Cash flows provided by (used in) investing activities:
Proceeds from sale of property and equipment			(14,330)	(10,459)
Proceeds from Sale of Property, Plant, and Equipment			0	318
Payments to Develop Software			(2,075)	(2,784)
Net cash used in investing activities			(16,405)	(12,925)
Repayments on senior term loan			0	0
Repayments of Notes Payable			(13)
Cash flows from financing activities:
Repayments on note payable				(24)
Proceeds from sale leaseback transaction				0
Repayments of Long-term Capital Lease Obligations			0	0
Sale Leaseback Transaction, Payments, Financing Activities			0	0
Excess tax benefit realized from stock-based compensation				0
Adjustments to Additional Paid in Capital, Other			0
Net cash provided by (used in) financing activities			(13)	(24)
Effect of foreign exchange rate changes on cash			0	0
Change in cash and cash equivalents			4,176	(1,050)
Cash and cash equivalents at beginning of period			1,158	1,797
Cash and cash equivalents at end of period	5,334	747	5,334	747
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Capital lease obligations, less current portion	55		55		60
Capital lease obligations, current portion	10		10		7
Transaction and severance costs	0	0	0	0
Cash flows provided by (used in) operating activities:
Net Cash Provided by (Used in) Operating Activities			294	(510)
Cash flows provided by (used in) investing activities:
Proceeds from sale of property and equipment			(649)	(127)
Proceeds from Sale of Property, Plant, and Equipment			0	0
Payments to Develop Software			0	0
Net cash used in investing activities			(649)	(127)
Repayments on senior term loan			0	0
Repayments of Notes Payable			0
Cash flows from financing activities:
Repayments on note payable				0
Proceeds from sale leaseback transaction				0
Repayments of Long-term Capital Lease Obligations			(3)	(2)
Sale Leaseback Transaction, Payments, Financing Activities			0	0
Excess tax benefit realized from stock-based compensation				0
Adjustments to Additional Paid in Capital, Other			0
Net cash provided by (used in) financing activities			(3)	(2)
Effect of foreign exchange rate changes on cash			239	484
Change in cash and cash equivalents			(119)	(155)
Cash and cash equivalents at beginning of period			6,777	6,622
Cash and cash equivalents at end of period	6,658	6,467	6,658	6,467
Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Capital lease obligations, less current portion	13,249		13,249		13,542
Capital lease obligations, current portion	539		539		460
Transaction and severance costs	490	427
Cash flows from financing activities:
Proceeds from sale leaseback transaction				4,073
Cash and cash equivalents at beginning of period			53,088
Cash and cash equivalents at end of period	77,470		77,470
Issuer
Condensed Financial Statements, Captions [Line Items]
Transaction and severance costs			570	1,129
Cash flows provided by (used in) operating activities:
Net Cash Provided by (Used in) Operating Activities			55,867	66,349
Cash flows provided by (used in) investing activities:
Proceeds from sale of property and equipment			(32,066)	(31,814)
Proceeds from Sale of Property, Plant, and Equipment			237	0
Payments to Develop Software			0	(3,439)
Net cash used in investing activities			(31,829)	(35,253)
Repayments on senior term loan			(3,800)	(3,800)
Repayments of Notes Payable			0
Cash flows from financing activities:
Repayments on note payable				0
Repayments of Long-term Capital Lease Obligations			(215)	(202)
Sale Leaseback Transaction, Payments, Financing Activities			(1,161)	(956)
Excess tax benefit realized from stock-based compensation				4
Adjustments to Additional Paid in Capital, Other			(1,447)
Net cash provided by (used in) financing activities			344	(4,954)
Effect of foreign exchange rate changes on cash			0	0
Change in cash and cash equivalents			24,382	26,142
Cash and cash equivalents at beginning of period			53,088	42,235
Cash and cash equivalents at end of period	77,470	68,377	77,470	68,377
Eliminations
Condensed Financial Statements, Captions [Line Items]
Capital lease obligations, less current portion	0		0		0
Capital lease obligations, current portion	0		0		$ 0
Transaction and severance costs	0	0	0	0
Cash flows provided by (used in) operating activities:
Net Cash Provided by (Used in) Operating Activities			0	0
Cash flows provided by (used in) investing activities:
Proceeds from sale of property and equipment			0	0
Proceeds from Sale of Property, Plant, and Equipment			0	0
Payments to Develop Software			0	0
Net cash used in investing activities			0	0
Repayments on senior term loan			0	0
Repayments of Notes Payable			0
Cash flows from financing activities:
Repayments on note payable				0
Proceeds from sale leaseback transaction				0
Repayments of Long-term Capital Lease Obligations			0	0
Sale Leaseback Transaction, Payments, Financing Activities			0	0
Excess tax benefit realized from stock-based compensation				0
Adjustments to Additional Paid in Capital, Other			0
Net cash provided by (used in) financing activities			0	0
Effect of foreign exchange rate changes on cash			0	0
Change in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0	$ 0