Consolidated Statement of Changes in Stockholders’ Equity - USD ($) shares in Thousands, $ in Millions	Total	Total Stockholders' Equity of Scholastic Corporation	Common Stock	Common Stock Class A Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock At Cost	Noncontrolling Interest
Beginning balance (in shares) at May. 31, 2021			32,700	1,700
Beginning balance at May. 31, 2021	$ 1,182.3	$ 1,180.8	$ 0.4	$ 0.0	$ 626.5	$ (34.7)	$ 916.4	$ (327.8)	$ 1.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (loss)	81.0	80.9					80.9		0.1
Foreign currency translation adjustment	(14.5)	(14.5)				(14.5)
Pension and post-retirement adjustments (net of tax of $0.3)	3.8	3.8				3.8
Stock-based compensation	7.8	7.8			7.8
Proceeds from issuance of common stock pursuant to stock-based compensation plans	10.4	10.4			10.4
Purchases of treasury stock at cost (in shares)			(900)
Purchases of treasury stock at cost	(33.4)	(33.4)						(33.4)
Treasury stock issued pursuant to stock purchase plans (in shares)			700
Treasury stock issued pursuant to equity-based plans	2.0	2.0			(17.7)			19.7
Dividends	(20.8)	(20.8)					(20.8)
Other (noncontrolling interest)	(0.2)								(0.2)
Ending balance at May. 31, 2022	1,218.4	1,217.0	$ 0.4	$ 0.0	627.0	(45.4)	976.5	(341.5)	1.4
Ending balance (in shares) at May. 31, 2022			32,500	1,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (loss)	86.5	86.3					86.3		0.2
Foreign currency translation adjustment	(5.4)	(5.4)				(5.4)
Pension and post-retirement adjustments (net of tax of $0.3)	(5.0)	(5.0)				(5.0)
Stock-based compensation	10.5	10.5			10.5
Proceeds from issuance of common stock pursuant to stock-based compensation plans	18.4	18.4			18.4
Purchases of treasury stock at cost (in shares)			(3,300)
Purchases of treasury stock at cost	(135.1)	(135.1)						(135.1)
Treasury stock issued pursuant to stock purchase plans (in shares)			800
Treasury stock issued pursuant to equity-based plans	3.4	3.4			(23.7)			27.1
Dividends	(27.2)	(27.2)					(27.2)
Ending balance at May. 31, 2023	1,164.5	1,162.9	$ 0.4	$ 0.0	632.2	(55.8)	1,035.6	(449.5)	1.6
Ending balance (in shares) at May. 31, 2023			30,000	1,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (loss)	12.1	12.1					12.1		0.0
Foreign currency translation adjustment	3.1	3.1				3.1
Pension and post-retirement adjustments (net of tax of $0.3)	0.2	0.2				0.2
Stock-based compensation	11.0	11.0			11.0
Proceeds from issuance of common stock pursuant to stock-based compensation plans	6.5	6.5			6.5
Purchases of treasury stock at cost (in shares)			(4,000)
Purchases of treasury stock at cost	(156.8)	(156.8)						(156.8)
Treasury stock issued pursuant to stock purchase plans (in shares)			500
Treasury stock issued pursuant to equity-based plans	3.6	3.6			(16.0)			19.6
Dividends	(24.0)	(24.0)					(24.0)
Other (share conversion) (in shares)			900	(900)
Other (share conversion)			$ 0.0		(28.6)			28.6
Other (noncontrolling interest)	(2.1)	(0.5)			(0.5)				(1.6)
Ending balance at May. 31, 2024	$ 1,018.1	$ 1,018.1	$ 0.4	$ 0.0	$ 604.6	$ (52.5)	$ 1,023.7	$ (558.1)	$ 0.0
Ending balance (in shares) at May. 31, 2024			27,400	800