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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Feb. 28, 2026	Nov. 30, 2025	Aug. 31, 2025	Feb. 28, 2025	Nov. 30, 2024	Aug. 31, 2024	Feb. 28, 2026	Feb. 28, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Less: Tax effect	$ (29.3)			$ 24.8			$ (23.4)	$ 32.9
Net income (loss) attributable to Scholastic Corporation	(62.5)	$ (55.9)	$ 71.1	3.6	$ (48.8)	$ 62.5	(47.3)	17.3
Amount reclassified from Accumulated other comprehensive income (loss) | Retirement benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized gain (loss)	0.4			0.3			1.2	1.0
Amortization of prior service (credit) loss	(0.3)			(0.3)			(0.7)	(0.7)
Less: Tax effect	0.1			0.1			0.2	0.2
Net income (loss) attributable to Scholastic Corporation	$ 0.2			$ 0.1			$ 0.7	$ 0.5

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