CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 391,753	$ 861,853
Other comprehensive loss
Foreign currency translation adjustments	(11,374)	(406)
Other	(112)	(82)
Total other comprehensive loss	(11,486)	(488)
Total comprehensive income	380,267	861,365
Comprehensive income attributable to noncontrolling interest	(245)	0
Comprehensive income attributable to AmerisourceBergen Corporation	$ 380,022	$ 861,365