Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Debt and Hedging Instruments (Foreign Debt Narrative) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Disposal Group, Held-for-sale, Not Discontinued Operations \| Acoustics Europe
Debt Instrument [Line Items]
Cash received to retire debt	$ 2,400,000
Secured Debt \| Individual Foreign Loans \| Minimum
Debt Instrument [Line Items]
Long-term debt gross		$ 200,000	$ 100,000
Secured Debt \| Individual Foreign Loans \| Maximum
Debt Instrument [Line Items]
Long-term debt gross		7,700,000	9,300,000
Germany \| Individual Foreign Loans
Debt Instrument [Line Items]
Debt instrument, face amount		$ 12,500,000	$ 15,000,000.0
Germany \| Individual Foreign Loans \| Minimum
Debt Instrument [Line Items]
Stated interest rate		1.80%
Germany \| Individual Foreign Loans \| Maximum
Debt Instrument [Line Items]
Stated interest rate		4.70%