CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,544,608	$ (3,399,558)	$ 854,135
Other comprehensive loss:
Foreign currency translation adjustments	(334,522)	(7,872)	(32,957)
Other, net	10	(1,074)	(271)
Total other comprehensive loss	(334,512)	(8,946)	(33,228)
Total comprehensive income (loss)	1,210,096	(3,408,504)	820,907
Comprehensive (income) loss attributable to noncontrolling interests	(6,776)	2,923	1,746
Comprehensive income (loss) income attributable to AmerisourceBergen Corporation	$ 1,203,320	$ (3,405,581)	$ 822,653