Term Loan and Line of Credit (Details) - USD ($)		12 Months Ended
	Dec. 02, 2014	Nov. 30, 2015	Nov. 30, 2014
Line of Credit Facility [Line Items]
Due in next 12 months		$ 9,375,000
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Term loan	$ 150,000,000
Unsecured credit facility	150,000,000
Additional borrowing capacity available	$ 75,000,000
Average interest rate during period (as a percent)		1.96%
Interest rate at end period (as a percent)		2.00%
Amount outstanding		$ 144,400,000
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		$ 400,000	$ 100,000
Domestic subsidiary capital stock guaranteeing debt (as a percent)		100.00%
Foreign subsidiary capital stock guaranteeing debt (as a percent)		65.00%
Credit Agreement [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee (as a percent)	0.25%
Credit Agreement [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee (as a percent)	0.40%
Credit Agreement [Member] | Eurodollar [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	1.50%
Credit Agreement [Member] | Eurodollar [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	2.25%
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	0.50%
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	1.25%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility outstanding amount	$ 700,000
Letter of Credit [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Unsecured credit facility	25,000,000.0
Line of credit facility outstanding amount		$ 500,000
Swing Line Loans [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Unsecured credit facility	$ 25,000,000.0