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v3.19.3

Segment and Geographic Information (Revenue By Geographic Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue | $ 1,255,631 | $ 1,241,824 | $ 1,164,039
United States [Member] |  |  |
Revenue | 514,400 | 487,300 | 475,500
Germany [Member] |  |  |
Revenue | 185,400 | 193,300 | 164,700
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Revenue | 1,311,494 | 1,241,824 | 1,164,039
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | United States [Member] |  |  |
Revenue | 541,700 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Germany [Member] |  |  |
Revenue | 197,200 |  |
Operating Segments [Member] |  |  |
Revenue | 1,255,631 | 1,241,824 | 1,164,039
Operating Segments [Member] | Americas [Member] |  |  |
Revenue | 537,548 | 511,237 | 500,879
Operating Segments [Member] | Europe [Member] |  |  |
Revenue | 464,666 | 485,851 | 435,183
Operating Segments [Member] | Asia Pacific [Member] |  |  |
Revenue | 253,417 | $ 244,736 | $ 227,977
Operating Segments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Revenue | 1,311,494 |  |
Operating Segments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Americas [Member] |  |  |
Revenue | 565,362 |  |
Operating Segments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Europe [Member] |  |  |
Revenue | 494,864 |  |
Operating Segments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Asia Pacific [Member] |  |  |
Revenue | $ 251,268 |  |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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