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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025	Nov. 30, 2025	Aug. 31, 2025	May 31, 2025	Nov. 30, 2024	Aug. 31, 2024	May 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	$ 7.7	$ (8.0)	$ 7.4	$ (11.7)
Amortization of net actuarial (gain) loss (net of tax of $0.0)	0.4	0.3	1.2	1.0
Amortization of prior service (credit) cost (net of tax of $0.1)	(0.2)	(0.2)	(0.5)	(0.5)
Other comprehensive income (loss)	7.9	(7.9)	8.1	(11.2)
Reclassification adjustment from AOCI, tax	0.0	0.0	0.0	0.0
Amortization of prior service credit, tax	0.1	0.1	0.2	0.2
Total stockholders’ equity of Scholastic Corporation	871.9	941.3	871.9	941.3	$ 931.2	$ 878.0	$ 946.5	$ 986.0	$ 957.3	$ 1,018.1
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total stockholders’ equity of Scholastic Corporation	(33.4)	(63.7)	(33.4)	(63.7)	(41.3)	$ (37.7)	(41.5)	(55.8)	$ (44.1)	(52.5)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	7.7	(8.0)	7.4	(11.7)
Amortization of net actuarial (gain) loss (net of tax of $0.0)	0.0	0.0	0.0	0.0
Amortization of prior service (credit) cost (net of tax of $0.1)	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	7.7	(8.0)	7.4	(11.7)
Total stockholders’ equity of Scholastic Corporation	(28.6)	(58.6)	(28.6)	(58.6)	(36.3)		(36.0)	(50.6)		(46.9)
Retirement benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	0.0	0.0	0.0	0.0
Amortization of net actuarial (gain) loss (net of tax of $0.0)	0.4	0.3	1.2	1.0
Amortization of prior service (credit) cost (net of tax of $0.1)	(0.2)	(0.2)	(0.5)	(0.5)
Other comprehensive income (loss)	0.2	0.1	0.7	0.5
Total stockholders’ equity of Scholastic Corporation	$ (4.8)	$ (5.1)	$ (4.8)	$ (5.1)	$ (5.0)		$ (5.5)	$ (5.2)		$ (5.6)

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