Note 6 - Stockholders' Equity (Detail) (USD $)	6 Months Ended	18 Months Ended
Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012
Closing Stock Price (in Dollars per share)	$ 83.04		$ 83.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)	$ 982,000	$ 1,161,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 43.97	$ 26.07
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 93.28		$ 53.77
Restricted Stock or Unit Expense (in Dollars)	3,260,000	5,369
Share Based Compensation Arrangement by Share Based Payment Award Market Price Less Discount	85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans	14,505	16,292
Equity Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance	5,400,000		5,400,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	1,730,000		1,730,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,553,779		1,553,779
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 12,388,000		$ 12,388,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 328 days
Employee Stock Purchase Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance	600,000		600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	260,157		260,157

TBD

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The percentage of market value at which employees are able to purchase shares of common stock.

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Aggregate number of common shares reserved for future issuance.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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