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Credit Facility (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Jun. 30, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Interest coverage ratio, less than |  | 3.50 |  |  |
Debt issuance amortization | $ 33,700,000 | $ 40,100,000 | $ 46,800,000 |  |
Description of variable rate basis |  | the highest of JPMorgan Chase Bank, N.A.'s prime rate, the federal funds rate plus a margin equal to 0.50% and the adjusted LIBOR rate for a 1-month interest period plus a margin equal to 1.00% |  |  |
Interest expense |  | $ 199,000,000 | 146,300,000 | $ 104,000,000 |
Foreign Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 125,000,000 |  |  |
Standby Letters of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 25,000,000 |  |  |
Line of Credit Facility Swingline Loan Sublimit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 25,000,000 |  |  |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 2,774,000,000.000
Credit facility |  | $ 0 |  |  |
Period for leverage ratio to determine interest rate spread |  | preceding four fiscal quarters |  |  |
Interest expense |  | $ 9,700,000 | 42,900,000 |  |
Interest rate spread on overdue principal in event of default |  | 2.00% |  |  |
Interest rate spread on overdue amounts in event of default |  | 2.00% |  |  |
2020 Tranche | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 3,122,000,000 |  |  |
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest expense |  |  |  | $ 18,900,000 |
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance amortization |  | 5,900,000 | 8,500,000 |  |
Credit facility |  | $ 0 | $ 0 |  |
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total leverage ratio, maximum |  | 5.00 |  |  |
Total consolidated debt, maximum |  | $ 700,000,000 |  |  |
Total leverage ratio, temporary maximum allowed, first four quarters |  | 5.50 |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  | 5.25 |  |  |
Senior leverage ratio, maximum |  | 3.50 |  |  |
Senior leverage ratio, minimum to obtain additional funding |  |  | 2.50 |  |
Repayments of lines of credit | 1,682,500,000 |  |  |  |
Debt issuance amortization | $ 2,100,000 |  |  |  |
Debt Instrument Interest Rate Option 2 | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Description of variable rate basis |  | adjusted LIBOR rate (based on one, two, three, or six-month interest periods) |  |  |
Minimum | Debt Instrument Interest Rate Option 1 | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 0.25% |  |  |
Maximum | Debt Instrument Interest Rate Option 1 | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |
Maximum | Debt Instrument Interest Rate Option 1 | February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |
Maximum | Debt Instrument Interest Rate Option 2 | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 2.25% |  |  |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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