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Description of Business and Summary of Significant Accounting Policies Investment Securities Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 05, 2019
Feb. 28, 2017
Feb. 28, 2019
Feb. 28, 2018
Feb. 27, 2019
Feb. 01, 2019
Jan. 23, 2019
Jan. 09, 2019
Jan. 07, 2019
Dec. 12, 2018
Nov. 30, 2018
Cumulative Effect on Retained Earnings, before Tax     $ (24)                
Notes, Loans and Financing Receivable, Gross, Noncurrent     0   $ 17,242   $ 16,818       $ 15,588
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities   $ 0   $ 0              
Cost-method Investments, Realized Losses   $ 0 $ 530 1,416              
Notes Receivable, Interest Rate, Rate Fixed     8.00%                
Notes, Loans and Financing Receivable, Gross, Current                     5,271
Payments to Acquire Investments $ 1,000                    
Fathom [Member] [Domain]                      
Cost Method Investments     $ 0 $ 547              
Cost Method Investment, Ownership Percentage       8.10%              
Notes Receivable [Member]                      
Notes, Loans and Financing Receivable, Gross, Noncurrent     $ 14,107                
August 31, 2019 [Domain] [Domain]                      
Notes, Loans and Financing Receivable, Gross, Current                     $ 10,588
Eye See 360 [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity           $ 1,423     $ 500 $ 1,000  
Other Receivables, Gross, Current               $ 231