Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Balance at Jan. 02, 2016	$ 426,179	$ 297,987	$ 22,327	$ 106,838	$ (6,113)	$ 5,140
Balance, shares at Jan. 02, 2016		85,418
Employee stock purchase plan, value	391	$ 391	0	0	0	0
Employee stock purchase plan, shares		83
Exercise of options	1,095	$ 2,048	(953)	0	0	0
Exercise of options, shares		243
Exercise of warrants, value	4,148	$ 0	4,148	0	0	0
Exercise of warrants, shares		0
Dividends preferred stock cash	(1,590)	$ 0	0	(1,590)	0	0
Preferred stock accretion to redemption value1	(222)	0	0	(222)	0	0
Earnings (loss) from continuing operations	(50,564)	0	0	(50,618)	0	54
Earnings (loss) from discontinued operations	(834)	0	0	(570)	0	(264)
Currency translation adjustment	(2,042)	0	0	0	(1,897)	(145)
Change in equity associated with disposal of discontinued operation	(7,148)	0	0	0	(5,094)	(2,054)
Change in fair value of interest rate swap, net of income taxes	(2,042)	0	0	0	(1,897)	(145)
Minority interest decrease from redemptions	0
Balance at Dec. 31, 2016	369,413	$ 300,426	25,522	53,838	(13,104)	2,731
Balance, shares at Dec. 31, 2016		85,744
Employee stock purchase plan, value	409	$ 409	0	0	0	0
Employee stock purchase plan, shares		61
Exercise of options	4,625	$ 8,064	(3,439)	0	0	0
Exercise of options, shares		952
Dividends preferred stock cash	(6,800)	$ 0	0	(6,800)	0	0
Preferred stock accretion to redemption value1	(1,009)	0	0	(1,009)	0	0
Stock based compensation	5,709	0	5,709	0	0	0
Earnings (loss) from continuing operations	(134,568)	0	0	(135,320)	0	752
Currency translation adjustment	6,184	0	0	0	6,223	(39)
Other comprehensive income (loss) derivatives qualifying as hedges, net of tax	(305)	0	0	0	(305)	0
Minority interest decrease from redemptions	(1,737)	0	214	0	(82)	(1,869)
Balance at Dec. 30, 2017	241,921	$ 308,899	28,006	(89,291)	(7,268)	1,575
Balance, shares at Dec. 30, 2017		86,757
AOCI including portion attributable to non-controlling interest tax	130
Employee stock purchase plan, value	630	$ 630	0	0	0	0
Employee stock purchase plan, shares		112
Exercise of options	1,311	$ 4,828	(3,517)	0	0	0
Exercise of options, shares		554
Dividends preferred stock cash	(6,800)	$ 0	0	(6,800)	0	0
Preferred stock accretion to redemption value1	(1,109)	0	0	(1,109)	0	0
Withholding taxes on stock-based awards	(632)	0	(632)	0	0	0
Stock based compensation	7,939	0	7,939	0	0	0
Earnings (loss) from continuing operations	(109,143)	0	0	(109,205)	0	62
Currency translation adjustment	(2,559)	0	0	0	(2,704)	145
Other comprehensive income (loss) derivatives qualifying as hedges, net of tax	305	0	0	0	305	0
Payment to non-controlling interest	(278)	0	0	0	0	(278)
Minority interest decrease from redemptions	0
Balance at Dec. 29, 2018	131,839	$ 314,357	31,796	(206,151)	(9,667)	1,504
Balance, shares at Dec. 29, 2018		87,423
Cumulative effect of adoption of new revenue accounting standard	254	$ 0	$ 0	$ 254	$ 0	$ 0
AOCI including portion attributable to non-controlling interest tax	$ 130