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BALANCE SHEET COMPONENTS: (Property and equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2013
Nov. 30, 2012
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 267,071 $ 245,718
Accumulated Depreciation (133,822) (122,795)
Property, Plant and Equipment, Net 133,249 122,923
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 22,665 18,699
Machinery and Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 107,528 101,994
Furniture and Fixtures [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 21,480 21,373
Building, Building Improvements and Leasehold improvements[Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 113,777 101,848
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 1,621 $ 1,804