| Senior Notes in Private Placement [Table Text Block] |
| | | | | | | | | | | | | | | | Applicable Note Purchase Agreement | | Maturity Date | | U.S. Dollar Value at March 31, 2020 | | U.S. Dollar Value at March 31, 2019 | $35,000 Senior notes at 6.43% | | 2008 Private Placement | | August 2020 | | 35,000 |
| | 35,000 |
| $91,000 Senior notes at 3.20% | | 2012 Private Placement | | December 2022 | | 91,000 |
| | 91,000 |
| $80,000 Senior notes at 3.35% | | 2012 Private Placement | | December 2024 | | 80,000 |
| | 80,000 |
| $25,000 Senior notes at 3.55% | | 2012 Private Placement | | December 2027 | | 25,000 |
| | 25,000 |
| $125,000 Senior notes at 3.45% | | 2015 Private Placement | | May 2025 | | 125,000 |
| | 125,000 |
| $125,000 Senior notes at 3.55% | | 2015 Private Placement | | May 2027 | | 125,000 |
| | 125,000 |
| $100,000 Senior notes at 3.70% | | 2015 Private Placement | | May 2030 | | 100,000 |
| | 100,000 |
| $50,000 Senior notes at 3.93% | | 2017 Private Placement | | February 2027 | | 50,000 |
| | 50,000 |
| €60,000 Senior notes at 1.86% | | 2017 Private Placement | | February 2027 | | 66,342 |
| | 67,352 |
| $45,000 Senior notes at 4.03% | | 2017 Private Placement | | February 2029 | | 45,000 |
| | 45,000 |
| €20,000 Senior notes at 2.04% | | 2017 Private Placement | | February 2029 | | 22,114 |
| | 22,450 |
| £45,000 Senior notes at 3.04% | | 2017 Private Placement | | February 2029 | | 55,767 |
| | 58,702 |
| €19,000 Senior notes at 2.30% | | 2017 Private Placement | | February 2032 | | 21,008 |
| | 21,328 |
| £30,000 Senior notes at 3.17% | | 2017 Private Placement | | February 2032 | | 37,178 |
| | 39,135 |
| Total Senior Notes | | | | | | $ | 878,409 |
| | $ | 884,967 |
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| Schedule of Maturities of Long-term Debt [Table Text Block] |
The combined annual aggregate amount of maturities of our outstanding debt by fiscal year is as follows: | | | | | 2021 (1) | $ | 35,000 |
| 2022 | — |
| 2023 | 366,449 |
| 2024 | — |
| 2025 and thereafter | 752,409 |
| Total | $ | 1,153,858 |
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| Schedule of Debt |
Indebtedness as of March 31, 2020 and 2019 was as follows: | | | | | | | | | | | | 2020 | | 2019 | Credit Agreement | | $ | 275,449 |
| | $ | 301,846 |
| Private Placement | | 878,409 |
| | 884,967 |
| Deferred financing fees | | (3,337 | ) | | (3,619 | ) | Other | | — |
| | 33 |
| Total long term debt | | $ | 1,150,521 |
| | $ | 1,183,227 |
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