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Property, Plant and Equipment | 12 Months Ended
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Mar. 31, 2019
Notes To Financial Statements [Abstract] |
Property, Plant and Equipment | 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. Depreciation and depletion expense were $127,174, $108,137 and $119,536, for the years ended March 31, 2019, 2018, and 2017, respectively. Rental expense for operating leases was $30,319, $30,474, and $32,740 for the years ended March 31, 2019, 2018, and 2017, respectively. Operating leases primarily relate to manufacturing, warehouse and office space, service facilities, vehicles, equipment, and communication systems. Certain lease agreements grant us varying renewal and purchase options. Future minimum annual rentals payable under noncancelable operating lease agreements at March 31, 2019 were as follows:
|  | Operating Leases
2020 |  | $ | 24,008 |
2021 |  | 18,567 |
2022 |  | 13,917 |
2023 |  | 11,929 |
2024 and thereafter |  | 93,939 |
Total minimum lease payments |  | $ | 162,360 |
In the preceding table, the future minimum annual rentals payable under noncancelable leases denominated in foreign currencies have been calculated using March 31, 2019 foreign currency exchange rates. Asset Retirement Obligations We provide contract sterilization services including Gamma irradiation which utilizes cobalt-60 in the form of cobalt pencils. We have incurred asset retirement obligations (ARO) associated with the future disposal of these assets once depleted. Recognition of ARO includes: the present value of a liability and offsetting asset, the subsequent accretion of that liability and depletion of the asset, and the periodic review of the ARO liability estimates and discount rates used in the analysis. The following table summarizes the activity in the liability for asset retirement obligations.
| Asset Retirement Obligations
Balance at March 31, 2017 | $ | 9,953 |
Liabilities incurred during the period | 89 |
Liabilities settled during the period | (352 | )
Accretion expense | 1,198 |
Foreign currency and other | 751 |
Balance at March 31, 2018 | $ | 11,639 |
Liabilities incurred during the period | 1,033 |
Accretion expense | 385 |
Foreign currency and other | (671 | )
Balance at March 31, 2019 | $ | 12,386 |

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- Definition Notes to Financial Statements [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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