Consolidated Balance Sheets Balance Sheet Parenthetical (USD $)	Dec. 30, 2014	Dec. 31, 2013
Capital Unit [Line Items]
Preferred Stock, Shares Issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred Stock, Shares Outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Treasury Stock, Shares	5,260,744us-gaap_TreasuryStockShares	4,283,405us-gaap_TreasuryStockShares
Common Class B [Member]
Capital Unit [Line Items]
Common Stock, Par or Stated Value Per Share	0.0001	0.0001
Common Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Shares, Issued	1,381,865	1,382,393
Common Stock, Shares, Outstanding	1,381,865	1,382,393
Common Class A [Member]
Capital Unit [Line Items]
Common Stock, Par or Stated Value Per Share	0.0001	0.0001
Common Stock, Shares Authorized	112,500,000	112,500,000
Common Stock, Shares, Issued	30,703,472	30,573,851
Common Stock, Shares, Outstanding	25,442,728	26,290,446
Preferred Stock [Member]
Capital Unit [Line Items]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	0.0001	0.0001
Preferred Stock, Shares Authorized (in shares)	2,000,000	2,000,000

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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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