XML 69 R53.htm IDEA: XBRL DOCUMENT v3.7.0.1
Summary of Significant Accounting Policies and Related Information - Intangibles (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Goodwill, intangible and other long-lived assets and impairments      
Impairment of intangible assets (excluding goodwill) $ 0    
Intangible asset amortization 28,308 $ 27,773 $ 25,328
Goodwill      
Goodwill deductible for tax purposes $ 113,000 $ 133,100  
Minimum      
Economic useful lives and amortization of intangible assets      
Amortization period 4 years    
Maximum      
Economic useful lives and amortization of intangible assets      
Amortization period 30 years    
Patent      
Economic useful lives and amortization of intangible assets      
Amortization period 14 years