Employee Severance, Litigation, and Other (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Employee severance	$ 10,815	$ 4,791	$ 29,621	$ 33,240
Litigation and opioid-related costs	18,828	39,031	47,189	49,468
Total employee severance, litigation, and other	60,006	75,553	156,067	143,023
Acquisition-related and integration costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	12,283	9,046	34,328	21,983
Business transformation efforts
Restructuring Cost and Reserve [Line Items]
Restructuring costs	16,289	13,020	33,141	23,680
Other restructuring initiatives
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1,791	$ 9,665	$ 11,788	$ 14,652