Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Nov. 30, 2023	May 31, 2025	May 31, 2024	May 31, 2023	Feb. 28, 2023
Class of Stock [Line Items]
Repurchases and retirement of common shares (in shares)		0	0	0
Deferred compensation obligation credited to common share option		$ 100,000		$ 0
Equity method investment ownership percentage retained		0.00%
Preferred shares, shares authorized		1,000,000	1,000,000
Preferred shares, shares issued		0	0
Preferred shares, shares outstanding		0	0
Common shares, authorized		150,000,000	150,000,000		100
Common shares, shares issued		49,548,895	49,331,514		100
Common shares, shares outstanding		49,548,895	49,331,514		100
Stock split description			The Amendment (i) effected a stock split of the 100 then-outstanding common shares of the Worthington Steel to provide a sufficient capitalization of the Worthington Steel to enable the Former Parent to complete the pro rata distribution of 100% of Worthington Steel’s outstanding common shares to Former Parent’s shareholders, with each Former Parent shareholder as of the previously announced record date of November 21, 2023 (the “Record Date”) receiving one common share of the Worthington Steel for every one common share of Worthington Industries held as of the Record Date, and (ii) eliminated Worthington Steel’s stated capital. On November 30, 2023, Worthington Steel distributed 49.3 million outstanding common shares to the Former Parent.
Percentage of pro rata distribution common shares		100.00%
Issuance of shares due to stock split	49,300,000
Shares outstanding due to stock split	49,300,000
Maximum
Class of Stock [Line Items]
Deferred compensation obligation credited to common share option			$ 100,000