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- Definition

Restructuring, Percentage Of Positions Affected

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Amount expected to be recognized in earnings for the specified restructuring cost.

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- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Restructuring Costs - Additional Information (Details)		6 Months Ended		12 Months Ended
Restructuring Costs - Additional Information (Details)	Nov. 11, 2020 USD ($) plant position office	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 02, 2020 USD ($)	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserves		$ 7,000,000	$ 7,000,000	$ 10,000,000		$ 8,000,000
Restructuring costs		8,000,000	15,000,000
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring reserves		7,000,000	7,000,000	10,000,000		$ 8,000,000
Restructuring costs		6,000,000	$ 15,000,000
Global Restructuring Programs 2021
Restructuring Cost and Reserve [Line Items]
Number of positions expected to be eliminated \| position	150
Global Restructuring Programs 2021 \| Aftermarket & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred	$ 19,000,000
Restructuring costs		6,000,000
Global Restructuring Programs 2021 \| Aftermarket & Industrial \| Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred	5,000,000
Global Restructuring Programs 2021 \| Aftermarket & Industrial \| Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred	9,000,000
Global Restructuring Programs 2021 \| Aftermarket & Industrial \| Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred	$ 5,000,000
Global Restructuring Programs 2020
Restructuring Cost and Reserve [Line Items]
Restructuring costs				10,000,000
Global Restructuring Programs 2020 \| Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred					$ 13,000,000
Percentage of global salaried positions affected					8.00%
Global Restructuring Programs 2020 \| Commercial Truck
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 2,000,000		7,000,000
Global Restructuring Programs 2020 \| Aftermarket & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs				$ 3,000,000
U.S. \| Global Restructuring Programs 2021 \| Aftermarket & Industrial
Restructuring Cost and Reserve [Line Items]
Expected number of facilities to close \| plant	3
Total Europe \| Global Restructuring Programs 2021 \| Aftermarket & Industrial
Restructuring Cost and Reserve [Line Items]
Expected number of facilities to close \| office	1