CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (loss)	$ (58.5)	$ (61.3)
Other comprehensive income (loss), net:
Foreign currency translation adjustment	(2.0)	(3.1)
Pension and postretirement adjustments (net of tax)	0.2	0.2
Total other comprehensive income (loss), net	(1.8)	(2.9)
Comprehensive income (loss)	(60.3)	(64.2)
Less: Net income (loss) attributable to noncontrolling interest		0.0
Comprehensive income (loss) attributable to Scholastic Corporation	$ (60.3)	$ (64.2)