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Debt and Credit Facility - Credit Facility (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Feb. 28, 2017
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance amortization |  | $ 24,400,000 | $ 83,600,000 |  | $ 40,100,000 |  |  |  | $ 33,700,000
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 3,840,000,000 | 3,600,000,000 |  | 3,120,000,000 |  |  |  |
Debt issuance amortization |  | 13,600,000 |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  | 244,300,000 |  |  |  |  |  |
Proceeds from long-term lines of credit | [1] |  | 4,416,500,000 |  | 187,000,000.0 |  | $ 1,537,000,000.0 |  |
Total consolidated debt, maximum |  |  | $ 700,000,000 |  |  |  |  |  |
Interest coverage ratio, less than |  |  | 3.25 |  |  |  |  |  |
Interest rate spread on overdue principal in event of default |  |  | 2.00% |  |  |  |  |  |
Interest rate spread on overdue amounts in event of default |  |  | 2.00% |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance amortization |  | 34,700,000 |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  | $ 3,000,000,000.0 | $ 3,000,000,000.0 | [1] | $ 0 | [1] | $ 0 | [1] |
Quarterly amortization payments, percent |  |  | 0.25% |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 1,090,000,000.00 |  |  |  |  |  |
Proceeds from lines of credit |  |  | 500,000,000.0 |  |  |  |  |  |
Loss on settlement of debt |  |  | (11,500,000) |  |  |  |  |  |
Foreign Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 250,000,000.0 |  |  |  |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 50,000,000.0 |  |  |  |  |  |
Line of Credit Facility Swingline Loan Sublimit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 25,000,000.0 |  |  |  |  |  |
2023 Tranche | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 3,600,000,000 |  |  |  |  |  |
Leverage Ratio Percent One | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Total leverage ratio, maximum |  |  | 6.75 |  |  |  |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  |  | 4.75 |  |  |  |  |  |
Leverage Ratio Percent One | Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 50.00% |  |  |  |  |  |
Leverage Ratio Percent Two | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Total leverage ratio, maximum |  |  | 6.25 |  |  |  |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  |  | 4.25 |  |  |  |  |  |
Leverage Ratio Percent Two | Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 25.00% |  |  |  |  |  |
Leverage Ratio Percent Three | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Total leverage ratio, maximum |  |  | 5.75 |  |  |  |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  |  | 3.75 |  |  |  |  |  |
Leverage Ratio Percent Three | Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 0.00% |  |  |  |  |  |
Minimum | Base Rate | 2023 Tranche | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.00% |  |  |  |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | 2023 Tranche | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.00% |  |  |  |  |  |
Maximum | Base Rate | 2023 Tranche | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.00% |  |  |  |  |  |
Maximum | London Interbank Offered Rate (LIBOR) | 2023 Tranche | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.00% |  |  |  |  |  |
[1] | During the fiscal year ended March 31, 2018, the Company issued $111.3 million principal amount of 2017 Junior Convertible Notes and 3.2 million shares of common stock in exchange for $111.3 million principal amount of 2007 Junior Convertible Notes. Refer to Note 12 Debt and Credit Facility for further discussion.

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