| Schedule of Change in Asset Retirement Obligation [Table Text Block] |
The following table summarizes the activity in the liability for asset retirement obligations. | | | | | | Asset Retirement Obligations | Balance at March 31, 2018 | $ | 11,639 |
| Liabilities incurred during the period | 1,033 |
| Accretion expense and change in estimate | 385 |
| Foreign currency and other | (671 | ) | Balance at March 31, 2019 | $ | 12,386 |
| Liabilities incurred during the period | 94 |
| Liabilities settled during the period | (168 | ) | Accretion expense and change in estimate | 453 |
| Foreign currency and other | (251 | ) | Balance at March 31, 2020 | $ | 12,514 |
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| Property, Plant and Equipment |
We generally depreciate or deplete property, plant, and equipment over the useful lives presented in the following table: | | | | | Asset Type | | Useful Life (years) | Land improvements | | 3-40 |
| Buildings and leasehold improvements | | 2-50 |
| Machinery and equipment | | 2-20 |
| Information Systems | | 2-20 |
| Radioisotope (cobalt-60) | | 20 |
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Information related to the major categories of our depreciable assets is as follows: | | | | | | | | | | March 31, | | 2020 | | 2019 | Land and land improvements (1) | | $ | 65,994 |
| | $ | 63,522 |
| Buildings and leasehold improvements | | 531,267 |
| | 480,359 |
| Machinery and equipment | | 682,488 |
| | 656,956 |
| Information systems | | 181,112 |
| | 169,711 |
| Radioisotope | | 508,593 |
| | 483,080 |
| Construction in progress (1) | | 159,731 |
| | 133,689 |
| Total property, plant, and equipment | | 2,129,185 |
| | 1,987,317 |
| Less: accumulated depreciation and depletion | | (1,017,330 | ) | | (955,735 | ) | Property, plant, and equipment, net | | $ | 1,111,855 |
| | $ | 1,031,582 |
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(1) Land is not depreciated. Construction in progress is not depreciated until placed in service.
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