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Assets and Liabilities Held for Sale	6 Months Ended
Assets and Liabilities Held for Sale	Mar. 31, 2017
Assets And Liabilities Held-For-Sale [Abstract]
Assets and Liabilities Held for Sale	Assets and Liabilities Held for Sale During the first quarter of 2017, management approved a plan to sell a business within the Commercial Truck & Industrial reporting segment. The company expects to sell the business within one year from management's approval of the plan. The business and its associated assets and liabilities met the criteria for presentation as held for sale as of December 31, 2016 and March 31, 2017. Assets and liabilities held for sale are measured at the lower of the carrying value or fair value less costs to sell. Upon meeting the held for sale criteria, the company determined the carrying value of the business exceeded the fair value less costs to sell. As a result, an impairment charge of $3 million was recorded within other operating expense, net in the company’s condensed consolidated statement of operations during the first quarter of 2017.