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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | Our significant financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2018 and 2017 were as follows:
| September 30, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Financial assets: |  |  |  |  |  |  |
Cash equivalents (1) | $ | 93,058 |  |  | $ | — |  |  | $ | — |  |  | $ | 93,058 |
Marketable securities: |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 219 |  |  | — |  |  | 219 |
Corporate notes/bonds | 54,737 |  |  | — |  |  | — |  |  | 54,737 |
U.S. government agency securities | — |  |  | 995 |  |  | — |  |  | 995 |
Forward contracts | — |  |  | 2,889 |  |  | — |  |  | 2,889 |
| $ | 147,795 |  |  | $ | 4,103 |  |  | $ | — |  |  | $ | 151,898 |
Financial liabilities: |  |  |  |  |  |  |
Contingent consideration related to acquisitions | $ | — |  |  | $ | — |  |  | $ | 1,575 |  |  | $ | 1,575 |
Forward contracts | — |  |  | 3,419 |  |  | — |  |  | 3,419 |
| $ | — |  |  | $ | 3,419 |  |  | $ | 1,575 |  |  | $ | 4,994 |
| September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Financial assets: |  |  |  |  |  |  |
Cash equivalents (1) | $ | 49,845 |  |  | $ | — |  |  | $ | — |  |  | $ | 49,845 |
Marketable securities: |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 240 |  |  | — |  |  | 240 |
Corporate notes/bonds | 47,673 |  |  | — |  |  | — |  |  | 47,673 |
U.S. government agency securities | — |  |  | 2,402 |  |  | — |  |  | 2,402 |
Forward contracts | — |  |  | 1,163 |  |  | — |  |  | 1,163 |
| $ | 97,518 |  |  | $ | 3,805 |  |  | $ | — |  |  | $ | 101,323 |
Financial liabilities: |  |  |  |  |  |  |
Contingent consideration related acquisitions | $ | — |  |  | $ | — |  |  | $ | 8,400 |  |  | $ | 8,400 |
Forward contracts | — |  |  | 4,347 |  |  | — |  |  | 4,347 |
| $ | — |  |  | $ | 4,347 |  |  | $ | 8,400 |  |  | $ | 12,747 |
(1) Money market funds and time deposits.
Changes in fair value of contingent consideration | Changes in the fair value of Level 3 contingent consideration liability associated with these acquisitions were as follows:
| Contingent Consideration
| (in thousands)
| ColdLight |  | Kepware |  | Other |  | Total
Balance at October 1, 2016 | $ | 2,500 |  |  | $ | 17,070 |  |  | $ | — |  |  | $ | 19,570 |
Change in fair value of contingent consideration | — |  |  | 930 |  |  | — |  |  | 930 |
Payment of contingent consideration | (2,500 | ) |  | (9,600 | ) |  | — |  |  | (12,100 | )
Balance at October 1, 2017 | $ | — |  |  | $ | 8,400 |  |  | $ | — |  |  | $ | 8,400 |
Contingent consideration at acquisition | — |  |  | — |  |  | 2,100 |  |  | 2,100 |
Payment of contingent consideration | — |  |  | (8,400 | ) |  | (525 | ) |  | (8,925 | )
Balance at September 30, 2018 | $ | — |  |  | $ | — |  |  | $ | 1,575 |  |  | $ | 1,575 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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