Depreciation is computed for financial reporting purposes using the straight-line method over the estimated useful lives of the related assets or the lease term, if shorter, as follows:
  Years
Buildings and leasehold improvements 
20 to 45 or the lease term if shorter
Machinery and production equipment 
3 to 18
Transportation equipment 
3 to 12
Property, plant and equipment, net as of the fiscal years ended March 31 consisted of the following:
(Amounts in thousands)20262025
Land, buildings and improvements$513,175 $405,417 
Machinery and production equipment1,175,0021,033,820
Transportation equipment224,845246,431
Construction in progress201,371190,515
Total cost2,114,3931,876,183
Less: accumulated depreciation(897,228)(825,143)
Property, plant and equipment, net$1,217,165 $1,051,040 
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Historical Timeline

Fiscal YearFiled
2026May 21, 2026Showing above
2025May 15, 2025
2024May 16, 2024
2023May 18, 2023
2022May 19, 2022
2021May 27, 2021
2020Jun 1, 2020
2019May 30, 2019
2018May 30, 2018
2017May 30, 2017
2016Sep 15, 2016
2015Mar 29, 2016

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.