Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions |
Jan. 06, 2017 |
May 31, 2026 |
|---|---|---|
| Performance Guarantee | ||
| Commitments and Contingencies Disclosure [Line Items] | ||
| Letter of credit facility outstanding amount | $ 29.3 | |
| Portland Harbor Superfund Site | ||
| Commitments and Contingencies Disclosure [Line Items] | ||
| Estimated undiscounted cost | $ 1,700.0 | |
| Period for remedial action | 13 years | |
| Period for monitoring | 30 years | |
| Portland Harbor Superfund Site | Minimum | ||
| Commitments and Contingencies Disclosure [Line Items] | ||
| Accuracy of cost estimate | 30.00% | |
| Portland Harbor Superfund Site | Maximum | ||
| Commitments and Contingencies Disclosure [Line Items] | ||
| Accuracy of cost estimate | 50.00% |