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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 28, 2015	Dec. 27, 2014	Mar. 29, 2014
Stockholders' equity:
Common stock, par value	$ 0.008us-gaap_CommonStockParOrStatedValuePerShare	$ 0.008us-gaap_CommonStockParOrStatedValuePerShare	$ 0.008us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	400,000,000us-gaap_CommonStockSharesAuthorized	400,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	168,347,000us-gaap_CommonStockSharesIssued	167,716,000us-gaap_CommonStockSharesIssued	166,623,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	136,416,000us-gaap_CommonStockSharesOutstanding	136,382,000us-gaap_CommonStockSharesOutstanding	138,691,000us-gaap_CommonStockSharesOutstanding
Preferred stock, par value	$ 1.00us-gaap_PreferredStockParOrStatedValuePerShare	$ 1.00us-gaap_PreferredStockParOrStatedValuePerShare	$ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized	40,000us-gaap_PreferredStockSharesAuthorized	40,000us-gaap_PreferredStockSharesAuthorized	40,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Treasury stock - shares	31,931,000us-gaap_TreasuryStockShares	31,334,000us-gaap_TreasuryStockShares	27,932,000us-gaap_TreasuryStockShares

X

- Definition

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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