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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Jan. 02, 2016 | Dec. 31, 2016 | Sep. 30, 2016
Financial assets: |  |  |  |
Cash equivalents |  |  | $ 60,418 | $ 60,139
Available-for-sale Securities |  |  | 49,834 | 49,616
Forward contracts |  |  | 4,505 | 260
Financial assets, fair value |  |  | 114,757 | 110,015
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | $ 19,570 |  | 16,594 | 19,570
Forward contracts |  |  | 629 | 3,170
Liabilities, Fair Value Disclosure, Recurring |  |  | 17,223 | 22,740
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Balance, October 1, 2016 | 19,570 |  |  |
Payment of contingent consideration | 3,100 | $ 1,300 |  |
Balance, December 31, 2016 | 16,594 |  |  |
Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents |  |  | 60,418 | 60,139
Forward contracts |  |  | 0 |
Financial assets, fair value |  |  | 95,017 | 94,740
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 0 |  | 0 |
Forward contracts |  |  | 0 | 0
Liabilities, Fair Value Disclosure, Recurring |  |  | 0 | 0
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Balance, December 31, 2016 | 0 |  |  |
Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents |  |  | 0 | 0
Available-for-sale Securities |  |  | 0 | 0
Forward contracts |  |  | 4,505 | 260
Financial assets, fair value |  |  | 19,740 | 15,275
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 0 |  | 0 | 0
Forward contracts |  |  | 629 | 3,170
Liabilities, Fair Value Disclosure, Recurring |  |  | 629 | 3,170
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Balance, October 1, 2016 | 0 |  |  |
Balance, December 31, 2016 | 0 |  |  |
Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents |  |  | 0 | 0
Forward contracts |  |  | 0 | 0
Financial assets, fair value |  |  | 0 | 0
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 19,570 |  | 16,594 | 19,570
Forward contracts |  |  | 0 | 0
Liabilities, Fair Value Disclosure, Recurring |  |  | 16,594 | 19,570
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Balance, October 1, 2016 | 19,570 |  |  |
Change in present value of contingent consideration | 74 |  |  |
Payment of contingent consideration | 3,050 |  |  |
Balance, December 31, 2016 | 16,594 |  |  |
Acquired entity name: ColdLight [Member] | Level 3 [Member] |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 2,500 |  | 1,250 | 2,500
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Balance, October 1, 2016 | 2,500 |  |  |
Change in present value of contingent consideration | 0 |  |  |
Payment of contingent consideration | 1,250 |  |  |
Balance, December 31, 2016 | 1,250 |  |  |
acquired entity name-Kepware [Domain] | Level 3 [Member] |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 17,070 |  | 15,344 | 17,070
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Balance, October 1, 2016 | 17,070 |  |  |
Change in present value of contingent consideration | 74 |  |  |
Payment of contingent consideration | 1,800 |  |  |
Balance, December 31, 2016 | 15,344 |  |  |
Acquired entity name: Kepware [Member] |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 15,300 |  | 15,300 |
Business Combination. Contingent Consideration [Roll Forward] |  |  |  |
Balance, December 31, 2016 | $ 15,300 |  |  |
Certificates of deposit | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | 880 | 681
Commercial Paper [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | 11,964 | 11,925
Corporate Bond Securities [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | 34,599 | 34,601
US Government Agencies Debt Securities [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | $ 2,391 | $ 2,409

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