CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net revenue	$ 2,826.0	$ 2,315.3	$ 2,241.4
Cost of goods sold	1,877.8	1,551.5	1,509.1
Gross profit	948.2	763.8	732.3
Operating expenses	574.0	442.7	451.6
Amortization expense	79.6	54.0	55.7
Loss (gain) on divestitures	0.0	3.1	(67.1)
Impairment charges	0.0	0.0	11.2
Interest expense, net	77.7	64.3	74.3
Income from continuing operations before income taxes	216.9	199.7	206.6
Income tax expense	102.8	84.0	78.6
Income from continuing operations	114.1	115.7	128.0
Supplemental Income Statement Elements [Abstract]
Income from discontinued operations (net of income tax expense)	19.5	99.5	127.2
Gain on divestiture of discontinued operations (net of income tax expense)	443.1	0.0	0.0
Total income from discontinued operations	462.6	99.5	127.2
Consolidated net income	576.7	215.2	255.2
Less: Net income attributable to noncontrolling interests	7.0	6.3	5.3
Net income attributable to Hillenbrand	$ 569.7	$ 208.9	$ 249.9
Net income - per share of common stock:
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.53	$ 1.52	$ 1.64
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	6.63	1.39	1.70
Basic (loss) earnings per share (in dollars per share)	8.16	2.91	3.34
Income (Loss) from Continuing Operations, Per Diluted Share	1.53	1.51	1.63
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	6.60	1.38	1.68
Diluted (loss) earnings per share (in dollars per share)	$ 8.13	$ 2.89	$ 3.31
Weighted-average shares outstanding-basic (in shares)	69.8	71.7	74.9
Weighted-average shares outstanding-diluted (in shares)	70.1	72.2	75.4