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Derivative Financial Instruments and Fair Value Measurements | 3 Months Ended
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Dec. 31, 2019
Derivative Financial Instruments and Fair Value Measurements |
Derivative Financial Instruments and Fair Value Measurements | 8. Derivative Financial Instruments and Fair Value Measurements ​ The Company uses interest rate derivative contracts to hedge interest rate exposures on the Company’s variable rate debt. The Company enters into foreign currency derivative contracts with financial institutions to reduce the risk that its cash flows and earnings will be adversely affected by foreign currency exchange rate fluctuations. The Company’s hedging program is not designated for trading or speculative purposes. ​ The Company recognizes derivative instruments as either assets or liabilities on the accompanying consolidated balance sheets at fair value. The Company records changes in the fair value (i.e., gains or losses) of the derivatives that have been designated as accounting hedges in the accompanying consolidated statements of operations as cost of revenue, interest expense or to accumulated other comprehensive loss in the accompanying consolidated balance sheets. ​ Cash Flow Hedges ​ The Company uses interest rate swap agreements designated as cash flow hedges to fix the variable interest rates on portions of the Company’s debt. The Company initially reports any gain on the effective portion of a cash flow hedge as a component of accumulated other comprehensive loss. Depending on the type of cash flow hedge, the gain is subsequently reclassified to interest expense when the interest expense on the variable rate debt is recognized. If the hedged transaction becomes probable of not occurring, any gain or loss related to interest rate swap agreements would be recognized in other income. ​ The notional principal in U.S. dollar (USD), Canadian dollar (CAD), and Australian dollar (AUD), fixed rates and related expiration dates of the Company’s outstanding interest rate swap agreements were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date
AUD | ​ | 200.0 | ​ | 2.19% | ​ | February 2021
CAD | ​ | 400.0 | ​ | 2.49% | ​ | September 2022
USD | ​ | 200.0 |  | 2.60% | ​ | February 2023
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2019
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date
AUD | ​ | 200.0 |  | 2.19% | ​ | February 2021
CAD | ​ | 400.0 |  | 2.49% | ​ | September 2022
USD | ​ | 200.0 |  | 2.60% | ​ | February 2023
​ Other Foreign Currency Forward Contracts ​ The Company uses foreign currency forward contracts which are not designated as accounting hedges to hedge intercompany transactions and other monetary assets or liabilities denominated in currencies other than the functional currency of a subsidiary. Gains and losses on these contracts were not material for the three months ended December 31, 2019 and 2018. ​ Fair Value Measurements ​ The Company’s non-pension financial assets and liabilities recorded at fair values relate to derivative instruments and were not material at December 31, 2019 or September 30, 2019. ​ See Note 14 for accumulated balances and reporting period activities of derivatives related to reclassifications out of accumulated other comprehensive loss for the three months ended December 31, 2019 and 2018. Amounts recognized in accumulated other comprehensive loss from the Company’s foreign currency options were immaterial for all periods presented. Amounts reclassified from accumulated other comprehensive loss into income from the foreign currency options were immaterial for all periods presented. Additionally, there were no material losses recognized in income due to amounts excluded from effectiveness testing from the Company’s interest rate swap agreements.

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- Definition Disclosure information pertaining to derivative instruments and fair value measurements. + References No definition available. + Details
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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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