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Fair Value Measurements (Details) - USD ($) | Nov. 30, 2022 | Aug. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 284,100,000 | $ 223,200,000
Short-term borrowings outstanding | 0 | 18,000,000.0
Line of Credit | Credit facility | The Credit Agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term borrowings outstanding | 0 | 18,000,000
Approximate fair value of short term borrowings | 0 | 18,000,000
Reported Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 12,000,000 | 11,900,000
Estimate of Fair Value Measurement | Unsecured debt | 2.150% Senior Unsecured Notes Due December 2030 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying and estimated fair values of financial instruments | $ 388,400,000 | $ 399,200,000

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