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Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | $ 226,288 |  | $ 226,288 |  | $ 121,093
Accumulated amortization | (101,059) |  | (101,059) |  | (90,426)
Net | 125,229 |  | 125,229 |  | 30,667
Amortization expense |  |  | 10,687 | $ 6,669 |
Goodwill | 206,693 |  | 206,693 |  | 153,422
Purchased and Core Technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 75,728 |  | 75,728 |  | 57,699
Accumulated amortization | (54,030) |  | (54,030) |  | (50,986)
Net | 21,698 |  | 21,698 |  | 6,713
License Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 112 |  | 112 |  | 102
Accumulated amortization | (105) |  | (105) |  | (74)
Net | 7 |  | 7 |  | 28
Patents and Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 22,748 |  | 22,748 |  | 14,577
Accumulated amortization | (13,111) |  | (13,111) |  | (11,970)
Net | 9,637 |  | 9,637 |  | 2,607
Customer Relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 125,300 |  | 125,300 |  | 46,315
Accumulated amortization | (31,593) |  | (31,593) |  | (25,266)
Net | 93,707 |  | 93,707 |  | 21,049
Non-compete Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 600 |  | 600 |  | 600
Accumulated amortization | (420) |  | (420) |  | (330)
Net | 180 |  | 180 |  | 270
Order backlog |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 1,800 |  | 1,800 |  | 1,800
Accumulated amortization | (1,800) |  | (1,800) |  | (1,800)
Net | 0 |  | 0 |  | $ 0
Cost of Sales and General and Administrative Expense |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization expense | $ 4,100 | $ 2,100 | $ 10,700 | $ 6,700 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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