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Equity Based Compensation (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
item
shares
Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for future issuance 25,000,000 25,000,000
Restricted Stock Units (RSUs) [Member] | Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted in period 4,436,758 4,436,758
Restricted Stock Units (RSUs) [Member] | Omnibus Incentive Plan [Member] | Graded Vesting Schedule [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   4 years
Restricted Stock Units (RSUs) [Member] | Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Tranche One [Member] | Cliff Vesting Schedule [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   1 year
Restricted Stock Units (RSUs) [Member] | Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Cliff Vesting Schedule [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   4 years
Performance Stock Units PSU [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted in period 1,079,621 1,079,621
Performance Stock Units PSU [Member] | Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of tranches | item   2
Performance Stock Units PSU [Member] | Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of tranches based on Joint Venture compound annual revenue growth rate | item   1
Period of calculation for compound annual revenue growth rate   3 years
Performance Stock Units PSU [Member] | Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Two [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of tranches based on Joint Venture compound annual adjusted EBITDA growth rate | item   1
Period of calculation for compound annual adjusted EBITDA growth rate   3 years
Cash Settled Restricted Stock Units CSRSU [Member] | Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   3 years
Granted in period 597,006 597,006
Deferred Stock Units DSU [Member] | Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   1 year
Granted in period 45,704 45,704
Vesting percentage   100.00%
Joint Venture [Member] | Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense | $ $ 6,096 $ 6,096
Unrecognized compensation expense | $ $ 87,211 $ 87,211
Minimum [Member] | Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   1 year
Maximum [Member] | Omnibus Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   4 years