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Fair Value Measurements | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Note 5 — Fair Value Measurements The Company accounts for certain assets and liabilities at fair value. Fair value is the price that would be received from selling an asset or that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability. The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. The Company categorizes each of its fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety. The three levels of inputs that may be used to measure fair value are as follows: Level 1: Quoted prices in active markets for identical assets or liabilities; Level 2: Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets), or other inputs that are observable (model-derived valuations in which significant inputs are observable) or can be derived principally from, or corroborated by, observable market data; and Level 3: Unobservable inputs that are supported by little or no market activity that is significant to the fair value of the assets or liabilities. The following tables present the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2025 and 2024:
|  | As of September 30, 2025 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Available-for-sale securities - money market funds |  | $ | 118,163 |  |  | $ | — |  |  | $ | — |  |  | $ | 118,163 |
Equity Investments |  |  | — |  |  |  | — |  |  |  | 32,540 |  |  |  | 32,540 |
Derivative financial instruments, net |  |  | — |  |  |  | 29,780 |  |  |  | — |  |  |  | 29,780 |
Acquisition-related liabilities |  |  | — |  |  |  | — |  |  |  | (49,649 | ) |  |  | (49,649 | )
Total |  | $ | 118,163 |  |  | $ | 29,780 |  |  | $ | (17,109 | ) |  | $ | 130,834 |
|  | As of September 30, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 142,920 |  |  | $ | — |  |  | $ | — |  |  | $ | 142,920 |
Corporate bonds |  |  | — |  |  |  | 108,420 |  |  |  | — |  |  |  | 108,420 |
U.S. government treasuries |  |  | 35,533 |  |  |  | — |  |  |  | — |  |  |  | 35,533 |
Supranational and sovereign debt |  |  | — |  |  |  | 16,660 |  |  |  | — |  |  |  | 16,660 |
Municipal bonds |  |  | — |  |  |  | 4,191 |  |  |  | — |  |  |  | 4,191 |
Asset backed obligations |  |  | — |  |  |  | 3,438 |  |  |  | — |  |  |  | 3,438 |
Total available-for-sale securities |  |  | 178,453 |  |  |  | 132,709 |  |  |  | — |  |  |  | 311,162 |
Equity Investments |  |  | — |  |  |  | — |  |  |  | 42,190 |  |  |  | 42,190 |
Derivative financial instruments, net |  |  | — |  |  |  | (6,380 | ) |  |  | — |  |  |  | (6,380 | )
Acquisition-related liabilities |  |  | — |  |  |  | — |  |  |  | (52,139 | ) |  |  | (52,139 | )
Total |  | $ | 178,453 |  |  | $ | 126,329 |  |  | $ | (9,949 | ) |  | $ | 294,833 |
Available-for-sale securities that are classified as Level 2 assets are priced using observable data that may include quoted market prices for similar instruments, market dealer quotes, market spreads, non-binding market prices that are corroborated by observable market data and other observable market information. The Company’s derivative instruments are classified as Level 2 as they represent foreign currency forward and option contracts valued primarily based on observable inputs including forward rates and yield curves. The Company did not have any transfers between Level 1 and Level 2 fair value measurements during fiscal year 2025. Level 3 liabilities relate to certain acquisition-related liabilities, which were generally valued using a Monte-Carlo simulation model and based on estimates of potential pay-out scenarios, valued during fiscal years 2025 and 2024. These liabilities were included in both accrued expenses and other current liabilities and other noncurrent liabilities as of September 30, 2025 and 2024. The decrease in Level 3 liabilities was primarily attributable to changes in the fair value recorded in the consolidated statement of income in fiscal year 2025, payments of certain acquisition-related liabilities, which were partially offset by new acquisition-related liabilities recorded against goodwill in connection with recent acquisitions. The decrease in Level 3 assets is primarily due to the sale of equity investments and, to a lesser extent, changes in fair value recorded in the consolidated statement of income in fiscal year 2025. Fair Value of Financial Instruments The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other current liabilities, accrued personnel costs approximate their fair value because of the relatively short maturity of these items, for the fair value of the Senior Notes, please see Note 13.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/820/tableOfContent + Details
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