CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014
Cash flows from operating activities--
Net earnings	$ 141,323	$ 141,563
Adjustments to reconcile net earnings to net cash provided by operating activities--
Depreciation and amortization	33,983	31,934
Non-cash share-based compensation	11,686	11,635
Deferred taxes	(1,536)	13,647
Changes in assets and liabilities, net of acquisitions
Accounts receivable, net	4,502	(20,786)
Inventories, net	(25,596)	(10,458)
Prepaid expenses and other assets	3,800	6,660
Accounts payable	6,534	(151)
Accrued expenses and other liabilities	(7,120)	(9,662)
Net cash provided by operating activities	167,576	164,382
Cash flows from investing activities--
Additions to property and equipment	(17,992)	(10,107)
Purchase of trade name		0
Payments for (Proceeds from) Previous Acquisition	1,000
Net cash (used in) investing activities	(279,915)	(86,792)
Cash flows from financing activities--
Net (repayments) proceeds under current revolving credit facilities	129,000	(63,400)
Net (repayments) proceeds under foreign bank loan	(1,385)	7,481
Proceeds from (Repayments of) Notes Payable	(26)	(26)
Repurchase of treasury stock	(4,836)	(44,283)
Excess tax benefit related to share-based compensation	2,396	24,947
Net cash (used in) provided by financing activities	125,149	(75,281)
Effect of exchange rates on cash and cash equivalents	(1,693)	(1,051)
Changes in cash and cash equivalents--
Net (decrease) increase in cash and cash equivalents	11,117	1,258
Cash and cash equivalents at beginning of year	43,945	36,894
Cash and cash equivalents at end of quarter	55,062	38,152
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		(10,240)
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		12,515
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
Aga [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross	(185,731)	0
Wunder-Bar [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Net of Cash Acquired	$ 0	$ 445