Accounts Payable, Accrued Liabilities and Guarantees 3 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 01, 2014
Accounts Payable and Accrued Liabilities [Line Items]
Impairment of long-lived assets and leasehold improvements	$ 863
Severance and related employee termination costs	452
HVAC Air Filtration Manufacturing Facility [Member]
Accounts Payable and Accrued Liabilities [Line Items]
Restructuring accrual at beginning of period	1,315
HVAC Air Filtration Manufacturing Facility [Member] | Cost of Sales [Member]
Accounts Payable and Accrued Liabilities [Line Items]
Restructuring accrual at beginning of period	1,186
HVAC Air Filtration Manufacturing Facility [Member] | Selling and Administrative Expenses [Member]
Accounts Payable and Accrued Liabilities [Line Items]
Restructuring accrual at beginning of period	$ 129