CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Scenario, Unspecified [Domain] - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014
Cash flows from operating activities--
Net earnings	$ 92,498	$ 81,850
Adjustments to reconcile net earnings to net cash provided by operating activities--
Depreciation and amortization	22,160	21,314
Non-cash share-based compensation	7,399	6,696
Deferred taxes	(1,644)	13,676
Changes in assets and liabilities, net of acquisitions
Accounts receivable, net	(1,271)	(20,297)
Inventories, net	(26,702)	(10,581)
Prepaid expenses and other assets	14,947	(8,140)
Accounts payable	5,236	3,818
Accrued expenses and other liabilities	(3,863)	(26,663)
Net cash provided by operating activities	108,760	61,673
Cash flows from investing activities--
Additions to property and equipment	(11,684)	(6,986)
Purchase of trade name		0
Payments for (Proceeds from) Previous Acquisition	1,000
Net cash (used in) investing activities	(87,876)	(67,711)
Cash flows from financing activities--
Net (repayments) proceeds under current revolving credit facilities	(24,500)	14,400
Net (repayments) proceeds under foreign bank loan	1,525	6,667
Proceeds from (Repayments of) Notes Payable	(18)	(18)
Repurchase of treasury stock	(4,836)	(44,283)
Excess tax benefit related to share-based compensation	2,400	24,986
Net cash (used in) provided by financing activities	(25,429)	1,752
Effect of exchange rates on cash and cash equivalents	(814)	(350)
Changes in cash and cash equivalents--
Net (decrease) increase in cash and cash equivalents	(5,359)	(4,636)
Cash and cash equivalents at beginning of year	43,945	36,894
Cash and cash equivalents at end of quarter	38,586	32,258
Stewart [Member]
Cash flows from investing activities--
Payments for (Proceeds from) Previous Acquisition	2,500
Payments to Acquire Businesses, Gross		0
Nieco Corporation [Member]
Cash flows from investing activities--
Payments for (Proceeds from) Previous Acquisition	4,200
Payments to Acquire Businesses, Gross		0
Market Forge Industries, Inc [Member]
Cash flows from investing activities--
Payments for (Proceeds from) Previous Acquisition	1,500
Payments to Acquire Businesses, Gross		(7,240)
Distributors 2014 [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross	0	(38,485)
Concordia [Member]
Cash flows from investing activities--
Payments for (Proceeds from) Previous Acquisition	(80)
Payments to Acquire Businesses, Net of Cash Acquired		0
ULine [Member]
Cash flows from investing activities--
Payments for (Proceeds from) Previous Acquisition	(275)
Payments to Acquire Businesses, Net of Cash Acquired		0
Desmon [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross		0
Payments to Acquire Businesses, Net of Cash Acquired	(13,947)
GoldsteinEswood [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross	(27,406)	0
Marsal [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross	(5,500)	0
Thurne [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross	(9,872)	0
Induc [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross	$ (10,622)	$ 0