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EMPLOYEE BENEFIT PLANS - Share-Based Incentive Plans Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Oct. 19, 2017 shares | Aug. 31, 2015 director $ / shares shares | Dec. 31, 2020 director $ / shares | Jun. 30, 2020 director $ / shares | Dec. 31, 2019 director $ / shares | Jun. 30, 2019 director $ / shares | Dec. 31, 2018 director $ / shares | Jun. 30, 2018 director $ / shares | Mar. 31, 2018 $ / shares | Jun. 30, 2017 director $ / shares | Jun. 30, 2016 director $ / shares | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, excess tax benefit amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 7,269,000 | $ 13,349,000 |  |
Payments related to tax withholding for share-based compensation | $ |  |  |  |  |  |  |  |  |  |  |  |  | 17,810,000 | $ 31,477,000 | $ 1,947,000
Compensation expense — equity and liability classified share awards (Note 14) | $ |  |  |  |  |  |  |  |  |  |  |  |  | 62,421,000 | 64,345,000 | $ 56,561,000
Unrecognized compensation cost | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 92,483,000 | $ 80,648,000 |
Unrecognized compensation cost, period for recognition |  |  |  |  |  |  |  |  |  |  |  |  | 2 years | 1 year 10 months 24 days |
2006 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate shares granted |  |  |  |  |  |  |  |  |  |  |  |  | 1,044,741 | 1,368,079 | 1,069,436
Granted (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 60.60 | $ 47.04 | $ 49.32
2016 Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period, restricted stock |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period, restricted stock |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |
Amended And Restated 2016 Incentive Award Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of shares authorized (in shares) | (12,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in share) | 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Director | 2016 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate shares granted |  | 48,716 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate shares granted, number of recipients | director |  | 2 | 2 | 4 | 1 | 4 | 1 | 3 |  | 3 |  |  |  |  |
Granted (in usd per share) | $ / shares |  | $ 21 | $ 63.01 | $ 60.60 | $ 47.21 | $ 47.22 | $ 42.41 | $ 44.50 |  | $ 33.54 |  |  |  |  |
April 1, 2018 | Class B | Amended And Restated 2016 Incentive Award Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of shares authorized (in shares) | 6,540,659 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage increase (decrease) to number of shares available for issuance | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
April 1, 2018 | Class A | Amended And Restated 2016 Incentive Award Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of shares authorized (in shares) | 6,540,659 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage increase (decrease) to number of shares available for issuance | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price 1 | Director | 2016 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate shares granted, number of recipients | director |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Granted (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 25.21 |  |  |  |
Exercise Price 2 | Director | 2016 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate shares granted, number of recipients | director |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Granted (in usd per share) | $ / shares |  |  |  |  |  |  |  |  | $ 23.93 |  |  |  |  |  |

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