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Stock-Based Compensation
3 Months Ended
Aug. 31, 2013
Stock-Based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
STOCK-BASED COMPENSATION
The company's stock-based compensation expense for the three month periods ended August 31, 2013 and September 1, 2012 was $2.8 million and $1.8 million, respectively. The related income tax benefit was $1.0 million and $0.7 million for the three month periods ended August 31, 2013 and September 1, 2012, respectively.

Stock-based compensation expense recognized in the Condensed Consolidated Statements of Comprehensive Income for the three month periods ended August 31, 2013 and September 1, 2012 has been reduced for estimated forfeitures, as it is based on awards ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Forfeitures are estimated based on historical experience.

Stock Option Plans
The company has stock option plans under which options to purchase the company's stock are granted to employees and non-employee directors and officers at a price not less than the market price of the company's common stock on the date of grant. Under the current award program, all options become exercisable between one year and three years from date of grant and expire ten years from date of grant. Most options are subject to graded vesting with the related compensation expense recognized on a straight-line basis over the requisite service period. The company estimated the fair value of employee stock options on the date of grant using the Black-Scholes model.

Employee Stock Purchase Program
Under the terms of the company's Employee Stock Purchase Plan, 4 million shares of authorized common stock were reserved for purchase by plan participants at 85 percent of the market price. The company recognizes pre-tax compensation expense related to the market value discount.

Restricted Stock Grants
The company periodically grants restricted common stock to certain key employees. Shares are granted in the name of the employee, who has all the rights of a shareholder, subject to certain restrictions on transferability and risk of forfeiture. The grants are subject to either cliff-based or graded vesting over a period not exceeding five years, and are subject to forfeiture if the employee ceases to be employed by the company for certain reasons. After the vesting period, the risk of forfeiture and restrictions on transferability lapse. The company recognizes the related compensation expense on a straight-line basis over the requisite service period.

Restricted Stock Units
The company grants restricted stock units to certain key employees. The awards generally cliff-vest after a three or five-year service period, with prorated vesting under certain circumstances and full or partial accelerated vesting upon retirement. Each restricted stock unit represents one equivalent share of the company's common stock to be issued, free of restrictions, after the vesting period. Compensation expense related to these awards is recognized over the requisite service period. Dividend equivalent awards are credited quarterly. The units do not entitle participants the rights of shareholders of common stock, such as voting rights, until shares are issued after the vesting period.

Performance Share Units
The company has granted performance share units to certain key employees. Each unit represents one equivalent share of the company's common stock. The number of common shares ultimately issued in connection with these performance share units is determined based on the company's internal EBITDA performance over the related three-year service period or the company's financial performance based on certain total shareholder return results as compared to a selected group of peer companies. Compensation expense is determined based on the grant-date fair value and the number of common shares projected to be issued, and is recognized over the requisite service period.