Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 29, 2015	Dec. 28, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 7,917	$ 8,526
Preferred stock, no par value (USD per share)	$ 0us-gaap_PreferredStockNoParValue	$ 0us-gaap_PreferredStockNoParValue
Preferred stock, shares authorized (shares)	500,000us-gaap_PreferredStockSharesAuthorized	500,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (shares)	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common stock, par value (USD per share)	$ 0.1	$ 0.1
Common stock, shares authorized (shares)	100,000,000us-gaap_CommonStockSharesAuthorized	100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (shares)	45,996,605us-gaap_CommonStockSharesIssued	45,840,171us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (shares)	41,960,693us-gaap_CommonStockSharesOutstanding	41,804,259us-gaap_CommonStockSharesOutstanding
Treasury stock (shares)	4,035,912us-gaap_TreasuryStockShares	4,035,912us-gaap_TreasuryStockShares

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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