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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Dec. 30, 2017 | Sep. 30, 2017
Financial assets: |  |  |  |
Cash equivalents |  |  | $ 74,705 | $ 49,845
Marketable securities |  |  | 50,567 | 50,315
Forward contracts |  |  | 2,694 | 1,163
Financial assets, fair value |  |  | 127,966 | 101,323
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | $ 8,400 |  | 4,643 | 8,400
Forward contracts |  |  | 4,333 | 4,347
Liabilities, Fair Value Disclosure, Recurring |  |  | 8,976 | 12,747
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | 8,400 |  |  |
Payment of contingent consideration | (3,800) | $ (3,100) |  |
Ending balance | 4,643 |  |  |
Level 1 |  |  |  |
Financial assets: |  |  |  |
Cash equivalents |  |  | 74,705 | 49,845
Financial assets, fair value |  |  | 122,662 | 97,518
Level 2 |  |  |  |
Financial assets: |  |  |  |
Forward contracts |  |  | 2,694 | 1,163
Financial assets, fair value |  |  | 5,304 | 3,805
Financial liabilities: |  |  |  |
Forward contracts |  |  | 4,333 | 4,347
Liabilities, Fair Value Disclosure, Recurring |  |  | 4,333 | 4,347
Level 3 |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 8,400 | 19,570 | 4,643 | 8,400
Liabilities, Fair Value Disclosure, Recurring |  |  | 4,643 | 8,400
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | 8,400 | 19,570 |  |
Change in present value of contingent consideration |  | 74 |  |
Payment of contingent consideration |  | (3,050) |  |
Ending balance | 4,643 | 16,594 |  |
ColdLight | Level 3 |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions |  | 2,500 |  |
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance |  | 2,500 |  |
Change in present value of contingent consideration |  | 0 |  |
Payment of contingent consideration |  | (1,250) |  |
Ending balance |  | 1,250 |  |
Kepware | Level 3 |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 8,400 | 17,070 | 4,643 | 8,400
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | 8,400 | 17,070 |  |
Change in present value of contingent consideration |  | 74 |  |
Payment of contingent consideration | (3,757) | (1,800) |  |
Ending balance | $ 4,643 | $ 15,344 |  |
Certificates of deposit |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  |  | 220 | 240
Certificates of deposit | Level 2 |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  |  | 220 | 240
Corporate notes/bonds |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  |  | 47,957 | 47,673
Corporate notes/bonds | Level 1 |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  |  | 47,957 | 47,673
U.S. government agency securities |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  |  | 2,390 | 2,402
U.S. government agency securities | Level 2 |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  |  | $ 2,390 | $ 2,402

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