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EMPLOYEE BENEFIT PLANS - Share-Based Incentive Plans Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 19, 2017
shares
Aug. 31, 2015
director
$ / shares
shares
Dec. 31, 2019
director
$ / shares
Jun. 30, 2019
director
$ / shares
Dec. 31, 2018
director
$ / shares
Jun. 30, 2018
director
$ / shares
Jun. 30, 2017
director
$ / shares
Jun. 30, 2016
director
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation, excess tax benefit amount | $                 $ 7,269,000 $ 8,000  
Payments related to tax withholding for share-based compensation | $                 31,477,000 1,947,000 $ 33,419,000
Compensation expense – restricted share grants (Note 14) | $                 64,345,000 56,561,000 $ 47,111,000
Unrecognized compensation cost | $                 $ 80,648,000 $ 77,348,000  
Unrecognized compensation cost, period for recognition                 1 year 10 months 24 days 1 year 4 months 24 days  
2006 Incentive Plan | Restricted Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Aggregate shares granted                 1,368,079 1,069,436 1,235,779
Granted (in usd per share) | $ / shares                 $ 47.04 $ 49.32 $ 34.86
2016 Incentive Plan                      
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   37,847                  
Aggregate shares granted, number of recipients | director   2 1 4 1 3 3        
Granted (in usd per share) | $ / shares   $ 21.00 $ 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