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Debt (Details) € in Thousands, £ in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Mar. 31, 2017 | Mar. 31, 2019 USD ($) | Jun. 30, 2018 | Mar. 31, 2018 USD ($) | Feb. 27, 2017 GBP (£) | Feb. 27, 2017 USD ($) | Feb. 27, 2017 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior Notes | $ 350,000 |  |  |  |  |  |  |
Long-term Debt, Current Maturities |  |  | $ 0 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 1,000,000 |  |  |
Debt Instrument, Face Amount |  |  | 884,967 |  | 988,190 |  |  |
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net |  |  | (3,619) |  | (3,395) |  |  |
Other Long-term Debt, Noncurrent |  |  | 33 |  | 0 |  |  |
Line of Credit Facility, Amount Outstanding |  |  | 301,846 |  | 331,206 |  |  |
Long-term Debt |  |  | 1,186,846 |  |  |  |  |
Long-term Debt |  |  | 1,183,227 |  | 1,316,001 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.00% |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 35,033 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 0 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  | 392,846 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  | $ 758,967 |  |  |  |  |
10 year maturity |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Term | 10 years | 10 years |  |  |  |  |  |
12 year maturity |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Term | 10 years | 10 years |  |  |  |  |  |
15 year maturity |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Term | 15 years |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | P15Y |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 500,000 |  |  |
United States of America, Dollars |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  | $ 95,000 |
United Kingdom, Pounds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior Notes | £ |  |  |  |  |  | £ 75,000 |  |
Euro Member Countries, Euro |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior Notes | € |  |  |  |  |  |  |  | € 99,000

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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