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Receivables (Activity In Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2021
Feb. 28, 2021
Nov. 30, 2020
Receivables [Abstract]      
Beginning balance $ 3,662 $ 3,751 $ 4,159
Charged to costs and expenses 1,066 46 247
Amounts written off (185) (135) (655)
Ending balance $ 4,543 $ 3,662 $ 3,751