Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

v2.4.0.8
Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 13 Months Ended 16 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Feb. 01, 2012
May 31, 2013
Employee Benefit Plans (Textual) [Abstract]          
Maximum percentage of salary deferral under 401(k) plan 50.00%        
Company contributions to the plan $ 13.1 $ 10.3 $ 3.5    
Amounts accrued under deferred compensation plans $ 10.7 $ 9.2     $ 10.7
Percentage of eligible pay that is matched by the employer 50.00%        
Percentage of employee pay eligible for employer matching contribution       4.00% 6.00%
Percentage of annual base salary that eligible employees can defer under Deferred Compensation Plan 50.00%        
Percentage of board cash compensation that may be deferred under Deferred Compensation Plan 100.00%