CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Cash flows from operating activities--
Net earnings	$ 38,231us-gaap_NetIncomeLoss	$ 33,445us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities--
Depreciation and amortization	11,232	10,521
Non-cash share-based compensation	2,029us-gaap_ShareBasedCompensation	1,938us-gaap_ShareBasedCompensation
Deferred taxes	2,975us-gaap_DeferredIncomeTaxExpenseBenefit	12,800us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities, net of acquisitions
Accounts receivable, net	(5,209)	(15,786)
Inventories, net	(15,023)us-gaap_IncreaseDecreaseInInventories	(5,638)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	2,188	(21,873)
Accounts payable	8,333	(2,415)
Accrued expenses and other liabilities	(21,000)	(26,550)
Net cash provided by operating activities	23,756	(13,558)
Cash flows from investing activities--
Additions to property and equipment	(6,117)	(3,231)
Net cash (used in) investing activities	(52,615)	(48,956)
Cash flows from financing activities--
Net (repayments) proceeds under current revolving credit facilities	41,500	78,400
Net (repayments) proceeds under foreign bank loan	432	5,463
Proceeds from (Repayments of) Notes Payable	(9)	(9)
Repurchase of treasury stock	(4,836)	(44,283)
Excess tax benefit related to share-based compensation	2,402	25,044
Net cash (used in) provided by financing activities	39,489	64,615
Effect of exchange rates on cash and cash equivalents	(316)	55
Changes in cash and cash equivalents--
Net (decrease) increase in cash and cash equivalents	10,314	2,156
Cash and cash equivalents at beginning of year	43,945	36,894
Cash and cash equivalents at end of quarter	54,259	39,050
Market Forge Industries, Inc [Member]
Cash flows from investing activities--
Payments to Acquire Businesses, Gross	0	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	(13,947)	0
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

The net cash inflows (outflows) associated with the entity's revolving credit facilities.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net cash inflow or outflow associated with the aggregate amount of adjustment to the purchase price of a previous acquisition.

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The cash outflow to reacquire common stock during the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.

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The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

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