Debt 2017 Senior Notes (Details)
€ in Thousands, £ in Thousands |
Mar. 31, 2020
GBP (£)
|
Mar. 31, 2020
USD ($)
|
Mar. 31, 2020
EUR (€)
|
Mar. 31, 2019
USD ($)
|
| Debt Instrument [Line Items] |
|
|
|
|
| Long-term Debt |
|
$ 1,150,521,000
|
|
$ 1,183,227,000
|
| 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 |
|
$ 66,342,000
|
€ 60,000
|
67,352,000
|
| 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 |
|
$ 22,114,000
|
€ 20,000
|
22,450,000
|
| 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
|
$ 55,767,000
|
|
58,702,000
|
| 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 |
|
$ 21,008,000
|
€ 19,000
|
21,328,000
|
| 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
|
$ 37,178,000
|
|
39,135,000
|
| Debt Instrument, Interest Rate, Stated Percentage |
3.17%
|
3.17%
|
3.17%
|
|
| Senior Notes [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Long-term Debt |
|
$ 878,409,000
|
|
$ 884,967,000
|