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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | Our significant financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2018 and September 30, 2017 were as follows:
| March 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Financial assets: |  |  |  |  |  |  |
Cash equivalents | $ | 82,291 |  |  | $ | — |  |  | $ | — |  |  | $ | 82,291 |
Marketable securities |  |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 219 |  |  | — |  |  | 219 |
Corporate notes/bonds | 52,650 |  |  | — |  |  | — |  |  | 52,650 |
U.S. government agency securities | — |  |  | 2,395 |  |  | — |  |  | 2,395 |
Forward contracts | — |  |  | 827 |  |  | — |  |  | 827 |
| $ | 134,941 |  |  | $ | 3,441 |  |  | $ | — |  |  | $ | 138,382 |
Financial liabilities: |  |  |  |  |  |  |  |  |
Contingent consideration related to acquisitions | $ | — |  |  | $ | — |  |  | $ | 6,743 |  |  | $ | 6,743 |
Forward contracts | — |  |  | 4,837 |  |  | — |  |  | 4,837 |
| $ | — |  |  | $ | 4,837 |  |  | $ | 6,743 |  |  | $ | 11,580 |
| September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Financial assets: |  |  |  |  |  |  |
Cash equivalents | $ | 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 to acquisitions | $ | — |  |  | $ | — |  |  | $ | 8,400 |  |  | $ | 8,400 |
Forward contracts | — |  |  | 4,347 |  |  | — |  |  | 4,347 |
| $ | — |  |  | $ | 4,347 |  |  | $ | 8,400 |  |  | $ | 12,747 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | Changes in the fair value of Level 3 contingent consideration liability associated with our acquisitions were as follows:
| Contingent Consideration
| (in thousands)
| Kepware |  | Other |  | Total
Balance, October 1, 2017 | $ | 8,400 |  |  | $ | — |  |  | $ | 8,400 |
Addition to contingent consideration | — |  |  | 2,100 |  |  | 2,100 |
Payment of contingent consideration | (3,757 | ) |  | — |  |  | (3,757 | )
Balance, March 31, 2018 | $ | 4,643 |  |  | $ | 2,100 |  |  | $ | 6,743 |
| Contingent Consideration
| (in thousands)
| ColdLight |  | Kepware |  | Total
Balance, October 1, 2016 | $ | 2,500 |  |  | $ | 17,070 |  |  | $ | 19,570 |
Change in present value of contingent consideration | — |  |  | 148 |  |  | 148 |
Payment of contingent consideration | (1,250 | ) |  | (1,800 | ) |  | (3,050 | )
Balance, April 1, 2017 | $ | 1,250 |  |  | $ | 15,418 |  |  | $ | 16,668 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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