Term Loan and Line of Credit (Narrative) (Details) - Credit Agreement [Member] - USD ($)		3 Months Ended
	Dec. 02, 2014	Feb. 29, 2016	Feb. 28, 2015
Line of Credit Facility [Line Items]
Term loan	$ 150,000,000
Unsecured credit facility	150,000,000
Additional borrowing capacity available	75,000,000
Interest rate during period (as a percent)		2.19%
Fair value of term loan		$ 140,600,000
Due in next 12 months		9,400,000
Principal payments for years one and two		1,900,000
Principal payments for years three and four		3,800,000
Principal payments for years five and thereafter		5,600,000
Debt issuance cost		1,800,000
Amortization of debt issuance costs		$ 100,000	$ 100,000
Percent of domestic subsidiary capital stock guaranteeing debt		100.00%
Percent of foreign subsidiary capital stock guaranteeing debt		65.00%
Letter of credit [Member]
Line of Credit Facility [Line Items]
Unsecured credit facility	25,000,000.0
Line of credit facility outstanding amount		$ 500,000
Revolving line of credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility outstanding amount		$ 0
Swing line loans [Member]
Line of Credit Facility [Line Items]
Unsecured credit facility	$ 25,000,000.0
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage	0.25%
Minimum [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	1.50%
Minimum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	0.50%
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage	0.40%
Maximum [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	2.25%
Maximum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	1.25%