Financial Statement Revision And Summary Of Significant Accounting Policies (Consolidated Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Cash flows from operating activities:
Net earnings	$ (66,626)	$ 27,614	$ 23,665
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	37,348	34,477	32,325
Deferred taxes	47,612	(2,859)	(6,911)
Stock-based compensation	7,408	8,751	7,135
Excess tax benefit on stock compensation	(634)	(1,662)	(12)
Provision for losses on accounts receivable	3,765	123	(117)
Loss on disposal of fixed assets	106	133	314
Restructuring-related asset impairment	7,843
(Increase) decrease in current assets, net of the effects of acquired companies:
Accounts receivable	(25,567)	(8,753)	27,464
Inventories	(23,821)	(20,535)	17,033
Other current assets	(14,065)	162	8,993
Increase (decrease) in current liabilities, net of the effects of acquired companies:
Accounts payable	1,064	2,705	(6,348)
Income taxes	(506)	(5,653)	3,483
Unearned revenues	10,780	(9,750)	11,654
Restructuring reserve	10,544	3,044	459
Other current and accrued liabilities	8,350	(16,070)	(6,092)
Net cash provided by operating activities	10,385	11,727	113,045
Cash flows from investing activities:
Acquisition of property, plant, and equipment and intangibles	(22,981)	(23,712)	(13,757)
Acquisitions of businesses, net of cash acquired	(75,937)	(300)	(25,535)
Change in restricted cash	15	504	516
Other investing activities	623	323	131
Net cash used in investing activities	(98,280)	(23,185)	(38,645)
Cash flows from financing activities:
Proceeds from stock issuances	2,210	6,022	845
Excess tax benefit on stock compensation	634	1,662	12
Proceeds from short-term debt	8,565	7,621	11,215
Payment of short-term debt	(7,895)	(12,344)	(12,941)
Proceeds from long-term debt	74,117	141,747	93,793
Payment of long-term debt	(67,370)	(114,458)	(144,650)
Net change in factoring and bank overdrafts	(4,364)	1,413	5,380
Debt issuance costs		(1,991)	(3,970)
Repurchase of non-controlling interests		(781)
Net cash provided by (used in) financing activities	5,897	28,891	(50,316)
Effect of foreign currency rate fluctuations on cash and cash equivalents	3,006	(4,970)	3,830
Net increase in cash and cash equivalents	(78,992)	12,463	27,914
Cash and cash equivalents:
Beginning of year	172,473	160,010	132,096
End of year	93,481	172,473	160,010
As Previously Reported [Member]
Cash flows from operating activities:
Net earnings		27,255	25,695
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization		34,477	32,325
Deferred taxes		(2,227)	(7,109)
Stock-based compensation		8,751	7,135
Excess tax benefit on stock compensation		(1,662)	(12)
Provision for losses on accounts receivable		123	(117)
Loss on disposal of fixed assets		133	314
(Increase) decrease in current assets, net of the effects of acquired companies:
Accounts receivable		(9,467)	27,308
Inventories		(20,707)	17,078
Other current assets		51	8,993
Increase (decrease) in current liabilities, net of the effects of acquired companies:
Accounts payable		2,491	(6,348)
Income taxes		(5,253)	3,584
Unearned revenues		(9,750)	11,654
Restructuring reserve		3,044	459
Other current and accrued liabilities		(16,355)	(6,133)
Net cash provided by operating activities		10,904	114,826
Cash flows from investing activities:
Acquisition of property, plant, and equipment and intangibles		(23,712)	(13,757)
Acquisitions of businesses, net of cash acquired		(300)	(25,535)
Change in restricted cash		504	516
Other investing activities		323	131
Net cash used in investing activities		(23,185)	(38,645)
Cash flows from financing activities:
Proceeds from stock issuances		6,022	845
Excess tax benefit on stock compensation		1,662	12
Proceeds from short-term debt		7,621	11,215
Payment of short-term debt		(12,344)	(12,941)
Proceeds from long-term debt		141,747	93,793
Payment of long-term debt		(114,458)	(144,650)
Net change in factoring and bank overdrafts		1,413	5,380
Debt issuance costs		(1,991)	(3,970)
Repurchase of non-controlling interests		(781)
Net cash provided by (used in) financing activities		28,891	(50,316)
Effect of foreign currency rate fluctuations on cash and cash equivalents		(4,905)	4,010
Net increase in cash and cash equivalents		11,705	29,875
Cash and cash equivalents:
Beginning of year		162,097	132,222
End of year		$ 173,802	$ 162,097