Long-Term Debt And Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended							3 Months Ended				0 Months Ended
	Feb. 28, 2012 Y	Nov. 30, 2011	Jun. 30, 2003	Feb. 28, 2012 Mortgage Note [Member]	Nov. 30, 2009 Unsecured Debt [Member]	Feb. 28, 2012 Cash Borrowings [Member]	Feb. 28, 2012 Standby Letters Of Credit [Member]	Feb. 28, 2012 Swing Line Loans [Member]	Feb. 28, 2012 Revolving Line Of Credit [Member]	Feb. 28, 2012 Letter Of Credit One [Member]	Feb. 28, 2012 Guarantee Credit Line [Member]	Feb. 28, 2012 Cash Borrowings And Letters Of Credit [Member]	Apr. 05, 2012 Amended Credit Agreement [Member]	Feb. 28, 2012 Amended Credit Agreement [Member]	Feb. 28, 2012 Maximum [Member]	Feb. 28, 2012 Minimum [Member]
Line of Credit Facility [Line Items]
Mortgage note payable	$ 37.5	$ 38.1	$ 54.0
Mortgage note payable, amortization period (years)	20
Mortgage note payable, fixed annual interest rate	5.50%
Debt principal balance				34.4
Minimum cash reserve for acquiring another company without consent of lender																50.0
Lines of credit facility, total borrowings	350.0													100.0
Revolving credit facility capacity					150.0	250.0	50.0	10.0	20.0		13.2	20.0
Credit facility outstanding							13.0			1.4
Unsecured revolving credit facility maturity date	Dec. 19, 2016
Credit facility amortized interest expense period (in years)	5
Margin on base rate															1.00%	0.25%
Spread over LIBOR	1.00%														2.00%	1.25%
Margin on federal funds	0.50%
Loan origination fees and issuance costs	1.9
Default applicable interest rate on all obligations	2.00%
Additional borrowings	100.0												50.0
Interest coverage ratio															3.5	1.0
Leverage ratio															2.5	1.0
Revolving Line of credit maturity date									November 2012
Bank guarantees	12.5	11.4
Restricted cash	$ 14.7	$ 13.8