Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Feb. 29, 2024	Feb. 28, 2023	May 13, 2022	Feb. 28, 2022	Jan. 03, 2022
Assets
Goodwill	$ 705,468	$ 702,512		$ 190,391
Other assets			$ 546
Total fair value of assets acquired					$ 28,591
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
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
Steel Creek Galvanizing Company, LLC
Assets
Accounts receivable					575
Inventories					3,593
Property, plant and equipment					15,796
Goodwill					7,755
Intangibles					872
Liabilities
Accounts payable and other accrued liabilities					765
Contingent consideration	$ (900)				2,826
Total fair value of liabilities assumed					3,591
Total purchase price, net of cash acquired					$ 25,000