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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Less: Tax effect	$ (21.2)	$ (24.6)	$ 8.1	$ (0.8)
Net income (loss) attributable to Scholastic Corporation			13.7	(2.7)
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	0.7	0.6
Amortization of prior service (credit) loss	(0.2)	(0.2)	(0.4)	(0.4)
Less: Tax effect	(0.0)	(0.0)	0.1	0.1
Net income (loss) attributable to Scholastic Corporation	$ 0.2	$ 0.1	$ 0.4	$ 0.3

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