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Revenue (Tables) | 12 Months Ended
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Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following summarizes our revenue by geographic location of our customers:
| Fiscal year ended September 30,
($ in thousands) | 2020 |  | 2019 |  | 2018
North America, primarily the United States | $ | 213,487 |  |  | $ | 184,022 |  |  | $ | 161,924 |
Europe, Middle East & Africa | 40,076 |  |  | 39,896 |  |  | 39,211 |
Rest of world | 25,708 |  |  | 30,285 |  |  | 25,758 |
Total revenue | $ | 279,271 |  |  | $ | 254,203 |  |  | $ | 226,893 |
The following summarizes our revenue by the timing of revenue recognition:
| Fiscal year ended September 30,
($ in thousands) | 2020 |  | 2019 |  | 2018
Transferred at a point in time | $ | 253,371 |  |  | $ | 231,387 |  |  | $ | 212,448 |
Transferred over time | 25,900 |  |  | 22,816 |  |  | 14,445 |
Total revenue | $ | 279,271 |  |  | $ | 254,203 |  |  | $ | 226,893 |
Contract with Customer, Asset and Liability | Changes in unearned revenue were:
|  | Fiscal year ended September 30,
($ in thousands) |  | 2020
Unearned revenue, beginning of period |  | $ | 5,025 |
Billings |  | 35,213 |
Revenue recognized |  | (30,897) |
Unearned revenue, end of period |  | $ | 9,341 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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