Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Jan. 06, 2017	Oct. 26, 2026	Aug. 31, 2026
Performance Guarantee
Commitments and Contingencies Disclosure [Line Items]
Letter of credit facility outstanding amount			$ 51.1
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%
Subsequent Event \| Pending Litigation \| Minimum
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, estimates possible loss		$ 0.0
Subsequent Event \| Pending Litigation \| Maximum
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, estimates possible loss		$ 110.0