Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Oct. 04, 2014	Oct. 03, 2015	Oct. 04, 2014
Operating Activities
Earnings (loss)	$ 536	$ (227)	$ 6,125	$ 15,390
Earnings (loss) from discontinued operations	(128)	233	(262)	297
Earnings (loss) from continuing operations	664	(460)	6,387	15,093
Items not affecting cash
Depreciation and amortization	5,741	5,489	16,703	16,347
Deferred income taxes	303	(947)	1,148	890
Stock-based compensation	1,901	1,079	4,140	2,884
Unrealized Gain (Loss) on Derivatives Instrument	(1,088)	1,802	(534)	2,021
Impairment loss on investment	0	8,441	0	8,441
Gain (loss) on sale of assets	126	(1,018)	19	(1,018)
Fair Value of Contingent Consideration	156	0	238	(1,373)
Impairment of long-lived assets (note 14)	0	505	0	505
Other	304	191	2,020	7
Changes in non-cash working capital, net of business acquired	14,565	3,245	(24,079)	(4,622)
Net cash flows from operations - continuing operations	22,672	18,327	6,042	39,175
Net cash flows from operations - discontinued operations	(128)	(327)	(262)	(589)
Net Cash Provided by (Used in) Operating Activities, Total	22,544	18,000	5,780	38,586
Investing activities
Acquisition of businesses, net of cash acquired	(6,475)	0	(19,775)	0
Purchases of property, plant and equipment	(7,373)	(5,109)	(22,812)	(12,565)
Acquisition of non-controlling interest	0	0	(733)	0
Increase in long-term investment	0	(871)	0	(871)
Payment of contingent consideration	0	0	(253)	(800)
Proceeds from sale of assets	239	5,688	1,292	5,688
Other	(22)	(435)	(45)	(484)
Net cash flows from investing activities - continuing operations	(13,631)	(727)	(42,326)	(9,032)
Net cash flows from investing activities - discontinued operations	0	327	0	589
Net cash flows from investing activities - continuing operations	(13,631)	(400)	(42,326)	(8,443)
Financing activities
Increase (decrease) under line of credit facilities	(6,309)	(15,973)	29,757	(29,538)
Borrowings under long term debt	0	0	0	210
Repayment of long-term debt	(1,407)	(1,502)	(4,200)	(4,658)
Financing costs	(2,157)	0	(2,188)	0
Proceeds from issuance of common shares	95,344	0	95,344	0
Proceeds From Stock Options Exercised	439	749	3,478	2,996
Proceeds From Warrant Exercises	0	0	3,879	0
Other	(179)	(75)	(459)	(154)
Net cash flows from financing activities - continuing operations	85,731	(16,801)	125,611	(31,144)
Foreign exchange gain (loss) on cash held in a foreign currency	(41)	(97)	(14)	(107)
Increase (decrease) in cash and cash equivalents during the period	94,603	702	89,051	(1,108)
Cash and cash equivalents - beginning of the period	4,386	6,727	9,938	8,537
Cash and cash equivalents - end of the period	98,989	7,429	98,989	7,429
Noncash Investing And Financing Items [Abstract]
Acquisition of business, working capital adjustment	237	0	502	0
Acquisition of business, settlement of pre-existing relationship	0	0	(749)	0
Acquistion of business, contingent consideration at fair value	$ (2,330)	$ 0	$ (22,330)	$ 0