Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Cash flows from operating activities:
Net income	$ 39,839	$ 23,747	$ 23,552
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,051	9,577	7,008
Amortization	6,477	6,096	3,413
Provision for (recovery on) allowance for doubtful accounts	576	81	(131)
Stock-based compensation	1,948	1,769	1,774
Amortization and write-offs of deferred financing costs	4,642	6,779	1,014
Derivative financial instruments			126
Deferred income taxes	(9,066)	6,277	5,993
Excess tax benefits on stock-based compensation		(1,872)	(3,840)
Fair value adjustment to contingent consideration		(3,000)
(Gain) loss on disposal of assets	(452)	(45)	10
Amortization of advance vendor consideration	(628)
Change in operating assets and liabilities (net of the effects of the acquisitions):
Accounts receivable	(17,922)	(7,069)	(7,263)
Inventories	(7,305)	(152)	(3,083)
Prepaid expenses and other current assets	(1,024)	2,215	(1,786)
Accounts payable and accrued liabilities	18,889	1,962	5,669
Net cash provided by operating activities	49,025	46,365	32,456
Cash flows from investing activities:
Purchases of property, plant and equipment	(17,818)	(17,694)	(17,391)
Business acquisitions		(101,338)
Proceeds from disposals of assets	3,089	45
Net cash used in investing activities	(14,729)	(118,987)	(17,391)
Cash flows from financing activities:
Payments of long-term debt	(40,132)	(203,525)	(2,000)
Proceeds from issuance of long-term debt		261,030
Payments of financing costs		(7,178)
Purchases and retirements of treasury stock	(284)	(2,847)	(44)
Proceeds from exercise of stock options	941	981	2,192
Proceeds from issuance of common stock under ESPP	29	36
Excess tax benefits on stock-based compensation		1,872	3,840
Other	(31)	(30)	(29)
Net cash (used in) provided by financing activities	(39,477)	50,339	3,959
Net (decrease) increase in cash and cash equivalents	(5,181)	(22,283)	19,024
Cash and cash equivalents at beginning of year	39,210	61,493	42,469
Cash and cash equivalents at end of year	34,029	39,210	61,493
Supplemental cash flow information:
Interest paid	16,329	16,015	11,502
Income tax payments, net of refunds	46	2,231	6,808
Non-cashactivity:
Financed purchase of software license	590
Contingent consideration reversed out of accrued liabilities		3,000
Portion of USI purchase price held-back by PGTI		85
Property, plant and equipment additions in accounts payable	$ 111	$ 251	$ 723