The grant-date fair value of awards granted during the reporting period.

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Represents the exercise period for participants that meet certain criteria upon retirement for vested stock options after modification of the equity-based compensation plan.

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Represents the exercise period for participants that meet certain criteria upon retirement for vested stock options before modification of the equity-based compensation plan.

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Represents the remaining period over which the incremental compensation expense associated with the modification of the equity-based compensation plan will be recognized.

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No definition available.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, shown as a percentage.

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No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Stock-Based Compensation Plans (Details) (2007 Stock Incentive Plan, USD $)	0 Months Ended	3 Months Ended
	Feb. 25, 2013	Mar. 30, 2013	Mar. 31, 2012
Stock Based Compensation Plans
Stock-based compensation		$ 4,467,000	$ 4,270,000
Income tax benefit related to stock-based compensation expense		1,587,000	1,515,000
Number of shares authorized for grant under 2007 plan		4,751,963
Aggregate grant-date fair value of awards granted	9,248,000
Stock option
Stock Based Compensation Plans
Granted (in shares)	328,467
Percentage of shares vesting in equal installments		33.00%
Term of Options granted under the plan (in Years)		10Y
Exercise price (in dollars per share)	$ 36.42
Assumptions used in estimation of grant date fair value of options based on the Black Scholes option pricing model
Expected term (years)	5.6
Risk-free interest rate (as a percent)	0.92%
Expected volatility (as a percent)	57.30%
Stock Based Compensation Plans
Vesting period (in years)		3 years
Exercise period after retirement for vested options before modification	90 days
Incremental stock option expense associated with the modification, net of estimated forfeitures	$ 2,500,000
Remaining vesting term for recognizing incremental stock option expense associated with the modification	1 year 8 months 12 days
Stock option \| Maximum
Stock Based Compensation Plans
Exercise period after retirement for vested options after modification	3 years
Vesting period after retirement for unvested options after modification	3 years
Restricted Stock
Stock Based Compensation Plans
Restricted stock grants (in shares)	85,461