CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Income Statement [Abstract]
Revenues	$ 597.2	$ 604.7	$ 829.8	$ 823.1
Operating costs and expenses:
Cost of goods sold	264.3	262.4	401.4	387.7
Selling, general and administrative expenses	212.4	229.7	379.9	393.4
Depreciation and amortization	15.4	14.4	30.8	27.6
Total operating costs and expenses	492.1	506.5	812.1	808.7
Operating income (loss)	105.1	98.2	17.7	14.4
Interest income (expense), net	0.0	0.5	0.7	1.3
Other components of net periodic benefit (cost)	(0.2)	(0.3)	(0.6)	(0.7)
Earnings (loss) before income taxes	104.9	98.4	17.8	15.0
Provision (benefit) for income taxes	33.8	26.8	5.2	4.7
Net income (loss)	71.1	71.6	12.6	10.3
Less: Net income attributable to noncontrolling interests	0.1	0.0	0.1	0.0
Net income (loss) attributable to Scholastic Corporation	$ 71.0	$ 71.6	$ 12.5	$ 10.3
Basic and diluted earnings (loss) per Share of Class A and Common Stock
Basic (in Dollars per share)	$ 2.04	$ 2.03	$ 0.36	$ 0.29
Diluted (in Dollars per share)	$ 2.02	$ 1.99	$ 0.35	$ 0.29