CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 971,111	$ 28,073	$ 1,157,679	$ 419,826
Other comprehensive (loss) income
Foreign currency translation adjustments	(55,858)	7,414	(30,405)	(3,960)
Other	15	225	34	113
Total other comprehensive (loss) income	(55,843)	7,639	(30,371)	(3,847)
Total comprehensive income	915,268	35,712	1,127,308	415,979
Comprehensive income attributable to noncontrolling interest	(68)	(836)	(234)	(1,081)
Comprehensive income attributable to AmerisourceBergen Corporation	$ 915,200	$ 34,876	$ 1,127,074	$ 414,898