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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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