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Fair Value - Other non-financial assets (Details) - Other Non-financial Assets - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Fair value measurement on non-recurring basis using significant unobservable inputs (Level 3)    
Beginning balances $ 958,756 $ 948,157
Total gains/income (losses/expense):    
Included in net income - realized (40,614) (31,547)
Acquired during the period 200,565 44,052
Acquisition adjustments and retirements during the period (289) (1,906)
Ending balances $ 1,118,418 $ 958,756