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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017 | Jul. 01, 2017 | Sep. 30, 2016
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash equivalents | $ 85,382 | $ 49,845 |  |
Marketable securities | 54,172 | 50,315 |  |
Forward contracts | 4,956 | 1,163 |  |
Financial assets, fair value | 144,510 | 101,323 |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 2,100 | 8,400 |  |
Forward contracts | 1,190 | 4,347 |  |
Liabilities, Fair Value Disclosure, Recurring | 3,290 | 12,747 |  |
Level 1 |  |  |  |
Financial assets: |  |  |  |
Cash equivalents | 85,382 | 49,845 |  |
Financial assets, fair value | 138,344 | 97,518 |  |
Level 2 |  |  |  |
Financial assets: |  |  |  |
Forward contracts | 4,956 | 1,163 |  |
Financial assets, fair value | 6,166 | 3,805 |  |
Financial liabilities: |  |  |  |
Forward contracts | 1,190 | 4,347 |  |
Liabilities, Fair Value Disclosure, Recurring | 1,190 | 4,347 |  |
Level 3 |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 2,100 | 8,400 | $ 7,862 | $ 19,570
Liabilities, Fair Value Disclosure, Recurring | 2,100 | 8,400 |  |
Certificates of deposit |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 219 | 240 |  |
Certificates of deposit | Level 2 |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 219 | 240 |  |
Corporate notes/bonds |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 52,962 | 47,673 |  |
Corporate notes/bonds | Level 1 |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 52,962 | 47,673 |  |
U.S. government agency securities |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 991 | 2,402 |  |
U.S. government agency securities | Level 2 |  |  |  |
Financial assets: |  |  |  |
Marketable securities | $ 991 | $ 2,402 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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