Consolidated Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Operating activities
Net earnings	$ 29,141	$ 34,075
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	41,346	41,993
(Gain) loss on disposal of property and equipment	137	(996)
Accretion of interest on convertible debentures	886	611
Inventory write-offs for obsolescence	4,213	5,220
Other	2,337	1,416
Net change in operating assets and liabilities, net of effects of businesses acquired	(54,669)	(59,697)
Net cash provided by operating activities	23,391	22,622
Investing activities
Capital expenditures	(20,181)	(16,815)
Proceeds from sale of property and equipment	769	2,789
Purchase of businesses, net of cash acquired	0	(85,642)
Purchase of short-term investments	(242,501)	(4,444)
Maturity of short-term investments	181,631	121,684
Other investing activities	627	443
Net cash (used in) provided by investing activities	(79,655)	18,015
Financing activities
Principal payments on long-term debt and capital leases	(8)	(5)
Net proceeds (payments) on revolving credit lines	1,000	(10,000)
Net changes in short-term borrowings	14	39
Proceeds from stock options exercised	0	174
Excess tax benefit from RSUs vested	436	0
Net cash provided by (used in) financing activities	1,442	(9,792)
Effect of exchange rate changes on cash and cash equivalents	(9,993)	5,848
Net (decrease) increase in cash and cash equivalents	(64,815)	36,693
Cash and cash equivalents at beginning of period	697,595	749,088
Cash and cash equivalents at end of period	$ 632,780	$ 785,781