| Assets and Liabilities Measured at Fair Value on Recurring Basis |
Assets and liabilities measured at fair value on a recurring basis at March 31, 2020 and September 30, 2019 consisted of the following (dollars in thousands): | | | | | | | | | | | | | | | | | | March 31, 2020 | Level 1 | | Level 2 | | Level 3 | | Total | Assets: | | | | | | | | Money market funds (a) | $ | 260,701 |
| | $ | — |
| | $ | — |
| | $ | 260,701 |
| Time deposits (b) | — |
| | 146,864 |
| | — |
| | 146,864 |
| Commercial paper, $33,207 at cost (b) | — |
| | 33,380 |
| | — |
| | 33,380 |
| Corporate notes and bonds, $23,605 at cost (b) | — |
| | 23,403 |
| | — |
| | 23,403 |
| Foreign currency exchange contracts (b) | — |
| | — |
| | — |
| | — |
| Total assets at fair value | $ | 260,701 |
| | $ | 203,647 |
| | $ | — |
| | $ | 464,348 |
| Liabilities: | | | | | | | | Foreign currency exchange contracts (b) | $ | — |
| | (297 | ) | | $ | — |
| | $ | (297 | ) | Contingent acquisition payments (c) | — |
| | — |
| | (2,493 | ) | | (2,493 | ) | Total liabilities at fair value | $ | — |
| | $ | (297 | ) | | $ | (2,493 | ) | | $ | (2,790 | ) |
| | | | | | | | | | | | | | | | | | September 30, 2019 | Level 1 | | Level 2 | | Level 3 | | Total | Assets: | | | | | | | | Money market funds (a) | $ | 217,861 |
| | $ | — |
| | $ | — |
| | $ | 217,861 |
| Time deposits (b) | — |
| | 115,913 |
| | — |
| | 115,913 |
| Commercial paper, $77,089 at cost (b) | — |
| | 77,494 |
| | — |
| | 77,494 |
| Corporate notes and bonds, $37,504 at cost (b) | — |
| | 37,566 |
| | — |
| | 37,566 |
| Foreign currency exchange contracts (b) | — |
| | 597 |
| | — |
| | 597 |
| Total assets at fair value | $ | 217,861 |
| | $ | 231,570 |
| | $ | — |
| | $ | 449,431 |
| Liabilities: | | | | | | | | Foreign currency exchange contracts (b) | $ | — |
| | $ | (327 | ) | | $ | — |
| | $ | (327 | ) | Contingent acquisition payments (c) | — |
| | — |
| | (2,925 | ) | | (2,925 | ) | Total liabilities at fair value | $ | — |
| | $ | (327 | ) | | $ | (2,925 | ) | | $ | (3,252 | ) |
|
| Changes in Fair Value of Contingent Earn-Out Liabilities |
The following table provides a summary of changes in the aggregate fair value of the contingent acquisition payments for all periods presented (dollars in thousands): | | | | | | | | | | | | | | | | | | Three Months Ended March 31, | | Six Months Ended March 31, | 2020 | | 2019 | | 2020 | | 2019 | Balance at beginning of period | $ | 2,493 |
| | $ | 3,979 |
| | $ | 2,550 |
| | $ | 4,000 |
| Earn-out liabilities established at time of acquisition | — |
| | — |
| | — |
| | — |
| Payments and foreign currency translation | — |
| | (2,529 | ) | | (57 | ) | | (2,550 | ) | Adjustments to fair value included in acquisition-related costs, net | — |
| | — |
| | — |
| | — |
| Balance at end of period | $ | 2,493 |
| | $ | 1,450 |
| | $ | 2,493 |
| | $ | 1,450 |
|
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