Debt and Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended				12 Months Ended
	Jun. 30, 2003	Nov. 30, 2012 Y	Nov. 30, 2011	Jul. 01, 2013 Mortgage Note	Jun. 30, 2003 Mortgage Note	Nov. 30, 2012 Mortgage Note	Nov. 30, 2011 Mortgage Note	May 31, 2007 Mortgage Note	Jul. 01, 2013 Cash Borrowings	Nov. 30, 2012 Letters Of Credit	Nov. 30, 2012 Swing Line Loans	Nov. 30, 2012 Revolving Line Of Credit	Dec. 31, 2011 Cash Borrowing And Letter Of Credit	Nov. 30, 2012 Letters Of Credit One	Nov. 30, 2012 Letters Of Credit Two	Nov. 30, 2012 Guarantee Credit Line	Nov. 30, 2011 Guarantee Credit Line	Nov. 30, 2012 Additional Borrowings For Letters Of Credit Or Cash	Nov. 30, 2012 Maximum	Nov. 30, 2012 Minimum	Nov. 30, 2012 Minimum Mortgage Note	Jul. 01, 2013 Repayment of Debt July 1, 2013 Mortgage Note
Line of Credit Facility [Line Items]
Mortgage note payable, face amount	$ 54.0				$ 54.0
Debt principal						35.7	38.1															34.4
Mortgage note payable amortization period (years)					20 years
Mortgage note payable fixed interest rate								5.50%
Term on principal balance (in years)						10 years
Debt maturity date				Jul. 01, 2013
Minimum cash reserve for acquiring another company without consent of lender																					50.0
Revolving credit facility, maximum capacity									250.0	50.0	10.0	20.0	20.0
Line Of Credit Facility Maximum Borrowing Capacity Increase																		100.0
Line Of Credit Facility Potential Maximum Borrowing Capacity																		350.0
Basis spread on variable rate																			1.25%	0.25%
Spread over LIBOR																			2.25%	1.25%
Base rate spread over federal fund rate		0.50%
LIBOR interest period (in months)		1 month
Base rate spread over LIBOR		1.00%
Loan origination fee and issuance costs		3.4
Interest expense amortization period (in years)		5
Default applicable interest rate on all obligations		2.00%
Interest coverage ratio																				3.5
Leverage ratio																			3.25
Leverage ratio one year from second quarter of current fiscal year																			3.00
Leverage ratio two years from second quarter of current fiscal year																			2.75
Revolving credit facility amount outstanding														13.0	1.0
Renewal period (in years)										1 year
Guarantee facility, maximum capacity																13.0
Bank guarantees																12.5	11.4
Restricted cash		$ 14.6	$ 13.8