Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 28, 2012	$ 480,860	$ 24	$ 320,618	$ (452)	$ 147,723	$ 12,947
Balance, shares at Dec. 28, 2012		23,732		(20)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	9,333		9,333
Net shares issued (acquired) under stock incentive plans	11,465	$ 0	12,245	$ (780)
Net shares issued under stock incentive plans, shares		636		(17)
Income tax benefit from stock options, restricted stock and restricted stock units	242		242
Shares contributed to 401(k) Plan	2,477	$ 0	2,477	$ 0
Shares contributed to 401(k) Plan, shares		91		0
Issuance of shares in connection with acquisition	0
Issuance of roll-over options in connection with acquisition	0
Net income (loss)	36,267				36,267
Total other comprehensive income (loss)	1,411					1,411
Balance at Jan. 03, 2014	542,055	$ 24	344,915	$ (1,232)	183,990	14,358
Balance, shares at Jan. 03, 2014		24,459		(37)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	8,921		8,921
Net shares issued (acquired) under stock incentive plans	3,465	$ 1	7,754	$ (4,290)
Net shares issued under stock incentive plans, shares		640		(86)
Income tax benefit from stock options, restricted stock and restricted stock units	4,357		4,357
Shares contributed to 401(k) Plan	4,341	$ 0	126	$ 4,215
Shares contributed to 401(k) Plan, shares		0		95
Issuance of shares in connection with acquisition	0
Issuance of roll-over options in connection with acquisition	0
Net income (loss)	55,458				55,458
Total other comprehensive income (loss)	(5,235)					(5,235)
Balance at Jan. 02, 2015	613,362	$ 25	366,073	$ (1,307)	239,448	9,123
Balance, shares at Jan. 02, 2015		25,099		(28)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	9,364		9,364
Net shares issued (acquired) under stock incentive plans	504	$ 1	5,764	$ (5,261)
Net shares issued under stock incentive plans, shares		585		(107)
Income tax benefit from stock options, restricted stock and restricted stock units	5,639		5,639
Shares contributed to 401(k) Plan	3,920	$ 0	452	$ 3,468
Shares contributed to 401(k) Plan, shares		0		72
Issuance of shares in connection with acquisition	245,368	$ 5	245,363
Issuance of shares in connection with acquisition, shares		4,980
Issuance of roll-over options in connection with acquisition	4,508		4,508
Purchase of non-controlling interests in subsidiaries	(16,693)		(16,693)
Net income (loss)	(7,594)				(7,594)
Total other comprehensive income (loss)	(7,753)					(7,753)
Balance at Jan. 01, 2016	$ 850,625	$ 31	$ 620,470	$ (3,100)	$ 231,854	$ 1,370
Balance, shares at Jan. 01, 2016		30,664		(63)