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Fair Value - Other Non-Financial Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Total income (expense):    
Reclassification to assets held for sale $ (27,573) $ 0
Other non-financial assets | Significant unobservable inputs (Level 3)    
Fair value measurement on non-recurring basis using significant unobservable inputs (Level 3)    
Beginning balances 893,846 905,235
Total income (expense):    
Included in net income - realized (62,287) (14,109)
Acquired during the period 236,898 2,815
Retirement adjustments during the period (31) (95)
Ending balances $ 1,040,853 $ 893,846