Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net revenue	$ 598.9	$ 786.6	$ 2,021.7	$ 2,345.2
Cost of goods sold	396.3	520.2	1,347.7	1,577.1
Gross profit	202.6	266.4	674.0	768.1
Selling, general and administrative expenses	146.3	174.2	497.2	513.5
Amortization expense	22.9	25.5	71.2	76.7
Loss on divestiture		0.0	56.1	0.0
Impairment charges	0.0	265.0	0.0	265.0
Pension settlement charges (gain)	0.0	26.9	(1.7)	35.2
Interest expense, net	21.3	32.2	69.6	92.8
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	10.6	(257.4)	(18.4)	(215.1)
Income tax expense (benefit)	6.5	(10.5)	7.2	3.7
Income (loss) from continuing operations	4.1	(246.9)	(25.6)	(218.8)
Loss from discontinued operations (net of income tax benefit)	0.0	0.0	0.0	(0.3)
Consolidated net income (loss)	4.1	(246.9)	(25.6)	(219.1)
Less: Net income attributable to noncontrolling interests	2.2	2.0	7.0	6.5
Net income (loss) attributable to Hillenbrand	$ 1.9	$ (248.9)	$ (32.6)	$ (225.6)
Basic earnings (loss) per share
Income from continuing operations attributable to Hillenbrand (in dollars per share)	$ 0.03	$ (3.53)	$ (0.46)	$ (3.20)
Income from discontinued operations (in dollars per share)	0	0	0	0
Net income (loss) attributable to Hillenbrand	0.03	(3.53)	(0.46)	(3.20)
Diluted earnings (loss) per share
Income from continuing operations attributable to Hillenbrand (in dollars per share)	0.03	(3.53)	(0.46)	(3.20)
Income from discontinued operations (in dollars per share)	0	0	0	0
Diluted earnings (loss) per share	$ 0.03	$ (3.53)	$ (0.46)	$ (3.20)
Weighted average shares outstanding (basic)	70.8	70.5	70.7	70.4
Weighted average shares outstanding (diluted)	70.8	70.5	70.7	70.4