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Debt 2017 Senior Notes (Details) € in Thousands, £ in Thousands | Mar. 31, 2019 GBP (£) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 EUR (€) | Jun. 30, 2018 | Mar. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 884,967,000 |  |  | $ 988,190,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.00% |
Long-term Debt |  | 1,183,227,000 |  |  | 1,316,001,000
STE 6.83% due 2018 Senior Notes [Member] [Domain] [Domain] [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 0 |  |  | 85,000,000
Debt Instrument, Interest Rate, Stated Percentage | 6.33% | 6.33% | 6.33% |  |
STE 6.93% due 2020 Senior Notes [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 35,000,000 |  |  | 35,000,000
Debt Instrument, Interest Rate, Stated Percentage | 6.43% | 6.43% | 6.43% |  |
STE 3.70% due 2030 Senior Notes [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 100,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.70% | 3.70% | 3.70% |  |
STE 3.70% due 2022 Senior Notes [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 91,000,000 |  |  | 91,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.20% | 3.20% | 3.20% |  |
STE 3.85% due 2024 Senior Notes [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 80,000,000 |  |  | 80,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.35% | 3.35% | 3.35% |  |
STE 4.05% due 2027 Senior Notes [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 25,000,000 |  |  | 25,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.55% | 3.55% | 3.55% |  |
STE 3.45% due 2025 Senior Notes [Member] [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 125,000,000 |  |  | 125,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.45% | 3.45% | 3.45% |  |
STE 3.55% due 2027 Senior Notes [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 125,000,000 |  |  | 125,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.55% | 3.55% | 3.55% |  |
STE 3.70% due 2030 Senior Notes [Member] [Domain] [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 100,000,000 |  |  | 100,000,000
STE 3.93% due 2027 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 50,000,000 |  |  | 50,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.93% | 3.93% | 3.93% |  |
STE 1.86% due 2027 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 67,352,000 | € 60,000 |  | 73,912,000
Debt Instrument, Interest Rate, Stated Percentage | 1.86% | 1.86% | 1.86% |  |
STE 4.03% due 2029 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 45,000,000 |  |  | 45,000,000
Debt Instrument, Interest Rate, Stated Percentage | 4.03% | 4.03% | 4.03% |  |
STE 2.04% due 2029 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 22,450,000 | € 20,000 |  | 24,637,000
Debt Instrument, Interest Rate, Stated Percentage | 2.04% | 2.04% | 2.04% |  |
STE 3.04% due 2029 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | £ 45,000 | $ 58,702,000 |  |  | 63,141,000
Debt Instrument, Interest Rate, Stated Percentage | 3.04% | 3.04% | 3.04% |  |
STE 2.30% due 2032 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 21,328,000 | € 19,000 |  | 23,406,000
Debt Instrument, Interest Rate, Stated Percentage | 2.30% | 2.30% | 2.30% |  |
STE 3.17% due 2032 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | £ 30,000 | $ 39,135,000 |  |  | 42,094,000
Debt Instrument, Interest Rate, Stated Percentage | 3.17% | 3.17% | 3.17% |  |
Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 884,967,000 |  |  | $ 988,190,000

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