CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (39.8)	$ (58.5)
Other comprehensive income (loss), net:
Foreign currency translation adjustment	10.7	(2.0)
Pension and postretirement adjustments (net of tax)	0.1	0.2
Total other comprehensive income (loss), net	10.8	(1.8)
Comprehensive income (loss)	(29.0)	(60.3)
Less: Net income (loss) attributable to noncontrolling interest	0.0	0.0
Comprehensive income (loss) attributable to Scholastic Corporation	$ (29.0)	$ (60.3)