Discontinued Operations - Discontinued Operations in Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 30, 2022	Feb. 28, 2023	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations		$ (119,313)	$ (119,313)	$ 34,205	$ 12,431
Earnings per common share from discontinued operations:
Earnings (loss) per common share from discontinued operations (in dollars per share)		$ (4.81)	$ (4.81)	$ 1.38	$ 0.48
Earnings (loss) per common share from discontinued operations (in dollars per share)		$ (4.78)	$ (4.78)	$ 1.36	$ 0.48
Discontinued Operations, Disposed of by Sale | AZZ Infrastructure Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales			$ 256,224	$ 377,066	$ 358,343
Cost of sales			202,707	297,996	292,496
Gross margin			53,517	79,070	65,847
Restructuring and impairment charges			0	(1,797)	3,894
Selling, general and administrative			26,186	46,747	47,817
Loss on disposal	$ 159,900		159,910	0	0
Operating income (loss) from discontinued operations			(132,579)	34,120	14,136
Interest expense			8	32	187
Other (income) expense, net			6,270	774	1,383
Income (loss) from discontinued operations before income tax			(138,857)	33,314	12,566
Income tax (benefit) expense			(19,544)	(891)	135
Net income (loss) from discontinued operations			$ (119,313)	$ 34,205	$ 12,431
Earnings per common share from discontinued operations:
Earnings (loss) per common share from discontinued operations (in dollars per share)			$ (4.81)	$ 1.38	$ 0.48
Earnings (loss) per common share from discontinued operations (in dollars per share)			$ (4.78)	$ 1.36	$ 0.48