Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2023	May 13, 2022	Feb. 28, 2022
Assets
Goodwill	$ 703,863	$ 705,468	$ 702,512
Other assets				$ 546
Cumulative Effect, Period of Adoption, Adjustment
Assets
Other assets				0
Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Other assets				546
Precoat Metals Business Division
Assets
Accounts receivable				77,422
Inventories				43,369
Contract assets				70,731
Prepaid expenses and other				2,247
Property, plant and equipment				305,503
Right-of-use asset				13,753
Goodwill				524,816
Deferred tax asset				8,660
Intangibles				446,000
Total fair value of assets acquired				1,493,047
Liabilities
Accounts payable and other accrued liabilities				99,223
Accrued expenses				31,201
Other accrued liabilities				5,330
Lease liability, short-term				2,440
Lease liability, long-term				11,313
Deferred tax liabilities				3,100
Other long-term liabilities				56,991
Total fair value of liabilities assumed				209,598
Total purchase price, net of cash acquired				1,283,449
Precoat Metals Business Division | Cumulative Effect, Period of Adoption, Adjustment
Assets
Accounts receivable				0
Inventories				0
Contract assets				(2,417)
Prepaid expenses and other				0
Property, plant and equipment				0
Right-of-use asset				0
Goodwill				2,977
Deferred tax asset				0
Intangibles				0
Total fair value of assets acquired				560
Liabilities
Accounts payable and other accrued liabilities				0
Accrued expenses				560
Other accrued liabilities				0
Lease liability, short-term				0
Lease liability, long-term				0
Deferred tax liabilities				(3,100)
Other long-term liabilities				3,100
Total fair value of liabilities assumed				560
Total purchase price, net of cash acquired				0
Precoat Metals Business Division | Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Accounts receivable				77,422
Inventories				43,369
Contract assets				68,314
Prepaid expenses and other				2,247
Property, plant and equipment				305,503
Right-of-use asset				13,753
Goodwill				527,793
Deferred tax asset				8,660
Intangibles				446,000
Total fair value of assets acquired				1,493,607
Liabilities
Accounts payable and other accrued liabilities				99,223
Accrued expenses				31,761
Other accrued liabilities				5,330
Lease liability, short-term				2,440
Lease liability, long-term				11,313
Deferred tax liabilities				0
Other long-term liabilities				60,091
Total fair value of liabilities assumed				210,158
Total purchase price, net of cash acquired				$ 1,283,449
DAAM Galvanizing Co. Ltd.
Assets
Accounts receivable					$ 3,082
Other receivables					171
Inventories					2,451
Prepaid expenses and other					0
Property, plant and equipment					11,462
Goodwill					13,691
Intangibles					9,975
Total fair value of assets acquired					40,832
Liabilities
Accounts payable and other accrued liabilities					3,910
Deferred tax liabilities					1,422
Total fair value of liabilities assumed					5,332
Total purchase price, net of cash acquired					$ 35,500