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Nature of Operations and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Impact of ASC 2014-09 Adoption [Table Text Block] |
| As Reported March 31, | Total | ASC 605 March 31,
Balance Sheet | 2019 | Adjustments | 2019
Total assets | $ | 5,073,071 |  | $ | (8,429 | ) | $ | 5,064,642 |
Total liabilities | 1,887,273 |  | (14,448 | ) | 1,872,825 |
Total equity | 3,185,798 |  | 6,019 |  | 3,191,817 |
Cash Flow, Supplemental Disclosures | Information supplementing our Consolidated Statements of Cash Flows is as follows:
Years Ended March 31, |  | 2019 |  | 2018 |  | 2017
Cash paid during the year for: |  |  |  |  |  |
Interest |  | $ | 44,118 |  |  | $ | 48,663 |  |  | $ | 42,797 |
Income taxes |  | 64,668 |  |  | 85,629 |  |  | 78,009 |
Cash received during the year for income tax refunds |  | 2,189 |  |  | 7,747 |  |  | 2,002 |
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 |
Information related to the major categories of our depreciable assets is as follows:
March 31, |  | 2019 |  | 2018
Land and land improvements (1) |  | $ | 63,522 |  |  | $ | 55,417 |
Buildings and leasehold improvements |  | 480,359 |  |  | 467,063 |
Machinery and equipment |  | 656,956 |  |  | 631,623 |
Information systems |  | 169,711 |  |  | 151,360 |
Radioisotope |  | 483,080 |  |  | 458,440 |
Construction in progress (1) |  | 133,689 |  |  | 87,745 |
Total property, plant, and equipment |  | 1,987,317 |  |  | 1,851,648 |
Less: accumulated depreciation and depletion |  | (955,735 | ) |  | (841,124 | )
Property, plant, and equipment, net |  | $ | 1,031,582 |  |  | $ | 1,010,524 |
(1) Land is not depreciated. Construction in progress is not depreciated until placed in service.

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