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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
Deferred Revenue | Deferred revenue consisted of the following:
| September 30,
| 2017 |  | 2016
| (in thousands)
Deferred subscription revenue | $ | 193,376 |  |  | $ | 102,847 |
Deferred support revenue | 256,999 |  |  | 297,684 |
Deferred perpetual license revenue | 1,773 |  |  | 4,151 |
Deferred professional services revenue | 6,759 |  |  | 8,975 |
Total deferred revenue | $ | 458,907 |  |  | $ | 413,657 |
Marketable Securities | The amortized cost and fair value of marketable securities as of September 30, 2017 and 2016 were as follows:
| September 30, 2017
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 240 |  |  | $ | — |  |  | $ | — |  |  | $ | 240 |
Corporate notes/bonds | 47,811 |  |  | 2 |  |  | (140 | ) |  | 47,673 |
U.S. government agency securities | 2,407 |  |  | — |  |  | (5 | ) |  | 2,402 |
| $ | 50,458 |  |  | $ | 2 |  |  | $ | (145 | ) |  | $ | 50,315 |
| September 30, 2016
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 681 |  |  | $ | — |  |  | $ | — |  |  | $ | 681 |
Commercial paper | 11,945 |  |  | — |  |  | (20 | ) |  | 11,925 |
Corporate notes/bonds | 34,701 |  |  | — |  |  | (100 | ) |  | 34,601 |
U.S. government agency securities | 2,411 |  |  | — |  |  | (2 | ) |  | 2,409 |
| $ | 49,738 |  |  | $ | — |  |  | $ | (122 | ) |  | $ | 49,616 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] | As of September 30, 2016, all securities were held for less than twelve months.
| September 30, 2017
| Less than twelve months |  | Greater than twelve months |  | Total
| Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss
| (in thousands)
Certificates of deposit | $ | 240 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 240 |  |  | $ | — |
Corporate notes/bonds | 15,254 |  |  | (43 | ) |  | 28,885 |  |  | (97 | ) |  | 44,139 |  |  | (140 | )
US government agency securities | — |  |  | — |  |  | 2,402 |  |  | (5 | ) |  | 2,402 |  |  | (5 | )
| $ | 15,494 |  |  | $ | (43 | ) |  | $ | 31,287 |  |  | $ | (102 | ) |  | $ | 46,781 |  |  | $ | (145 | )
Investments Classified by Contractual Maturity Date | The following table presents our available-for-sale marketable securities by contractual maturity date, as of September 30, 2017 and 2016.
| September 30, 2017 |  | September 30, 2016
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands) |  | (in thousands)
Due in one year or less | $ | 18,274 |  |  | $ | 18,244 |  |  | $ | 18,585 |  |  | $ | 18,549 |
Due after one year through three years | 32,184 |  |  | 32,071 |  |  | 31,153 |  |  | 31,067 |
| $ | 50,458 |  |  | $ | 50,315 |  |  | $ | 49,738 |  |  | $ | 49,616 |
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, 2017 and 2016 were as follows:
| 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 to acquisitions | $ | — |  |  | $ | — |  |  | $ | 8,400 |  |  | $ | 8,400 |
Forward contracts | — |  |  | 4,347 |  |  | — |  |  | 4,347 |
| $ | — |  |  | $ | 4,347 |  |  | $ | 8,400 |  |  | $ | 12,747 |
| September 30, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Financial assets: |  |  |  |  |  |  |
Cash equivalents (1) | $ | 60,139 |  |  | $ | — |  |  | $ | — |  |  | $ | 60,139 |
Marketable securities |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 681 |  |  | — |  |  | 681 |
Commercial paper | — |  |  | 11,925 |  |  | — |  |  | 11,925 |
Corporate notes/bonds | 34,601 |  |  | — |  |  | — |  |  | 34,601 |
U.S. government agency securities | — |  |  | 2,409 |  |  | — |  |  | 2,409 |
Forward contracts | — |  |  | 260 |  |  | — |  |  | 260 |
| $ | 94,740 |  |  | $ | 15,275 |  |  | $ | — |  |  | $ | 110,015 |
Financial liabilities: |  |  |  |  |  |  |
Contingent consideration related acquisitions | $ | — |  |  | $ | — |  |  | $ | 19,570 |  |  | $ | 19,570 |
Forward contracts | — |  |  | 3,170 |  |  | — |  |  | 3,170 |
| $ | — |  |  | $ | 3,170 |  |  | $ | 19,570 |  |  | $ | 22,740 |
(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)
| ThingWorx |  | ColdLight |  | Kepware |  | Total
Balance at October 1, 2015 | $ | 9,000 |  |  | $ | 4,000 |  |  | $ | — |  |  | $ | 13,000 |
Contingent consideration at acquisition | — |  |  | — |  |  | 16,900 |  |  | 16,900 |
Change in fair value of contingent consideration | — |  |  | 1,000 |  |  | 170 |  |  | 1,170 |
Payment of contingent consideration | (9,000 | ) |  | (2,500 | ) |  | — |  |  | (11,500 | )
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 September 30, 2017 | $ | — |  |  | $ | — |  |  | $ | 8,400 |  |  | $ | 8,400 |
Earnings Per Share Basic And Diluted | The following table presents the calculation for both basic and diluted EPS:
| Year ended September 30,
| 2017 |  | 2016 |  | 2015
| (in thousands, except per share data)
Net income (loss) | $ | 6,239 |  |  | $ | (54,465 | ) |  | $ | 47,557 |
Weighted average shares outstanding | 115,523 |  |  | 114,612 |  |  | 114,775 |
Dilutive effect of employee stock options, restricted shares and restricted stock units | 1,833 |  |  | — |  |  | 1,237 |
Diluted weighted average shares outstanding | 117,356 |  |  | 114,612 |  |  | 116,012 |
Basic earnings (loss) per share | $ | 0.05 |  |  | $ | (0.48 | ) |  | $ | 0.41 |
Diluted earnings (loss) per share | $ | 0.05 |  |  | $ | (0.48 | ) |  | $ | 0.41 |

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