Fair Value Measurements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 29, 2015	Aug. 30, 2014	Nov. 29, 2014
Assets
Marketable securities	$ 2,783,000		$ 2,783,000		$ 748,000
Derivative assets	9,854,000		9,854,000		1,007,000
Interest rate swaps	3,829,000		3,829,000		4,726,000
Liabilities [Abstract]
Derivative liabilities	1,308,000		1,308,000		433,000
Contingent Consideration Liability Continuing Operations Fair Value Disclosure	37,201,000		37,201,000		196,000
Contingent consideration liability, discontinued operations					5,000,000
Fair Value Of Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Asset impairment charges	0	$ 0	0	$ 0
Fair Value, Inputs, Level 1 [Member]
Assets
Marketable securities	2,783,000		2,783,000		748,000
Derivative assets					0
Liabilities [Abstract]
Derivative liabilities					0
Contingent Consideration Liability Continuing Operations Fair Value Disclosure					0
Contingent consideration liability, discontinued operations					0
Fair Value, Inputs, Level 2 [Member]
Assets
Marketable securities					0
Derivative assets	9,854,000		9,854,000		1,007,000
Interest rate swaps	3,829,000		3,829,000		4,726,000
Cash-flow hedges					5,408,000
Liabilities [Abstract]
Derivative liabilities	1,308,000		1,308,000		433,000
Contingent Consideration Liability Continuing Operations Fair Value Disclosure					0
Contingent consideration liability, discontinued operations					0
Fair Value, Inputs, Level 3 [Member]
Assets
Marketable securities					0
Derivative assets					0
Liabilities [Abstract]
Derivative liabilities					0
Contingent Consideration Liability Continuing Operations Fair Value Disclosure	$ 37,201,000		$ 37,201,000		196,000
Contingent consideration liability, discontinued operations					$ 5,000,000