Annual report pursuant to Section 13 and 15(d)

Business Combinations (Details)

v2.4.0.8
Business Combinations (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2011
Feb. 08, 2011
Sure Payroll Inc [Member]
May 03, 2011
E Plan Services Inc [Member]
Business Acquisition [Line Items]      
Number of businesses acquired 2    
Business acquisition, Cash paid, net of cash acquired   $ 114.9 $ 15.2
Business acquisition, Goodwill Amount   $ 83.9 $ 7.4