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Property, Plant and Equipment | 12 Months Ended
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Sep. 30, 2023
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 7. Property, Plant and Equipment Property, plant and equipment were as follows as of September 30, 2023 and 2022 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30,
​ | ​ | 2023 | ​ | 2022
Buildings, land, and land use right | ​ | $ | 41,870 | ​ | $ | 29,581
Computer equipment and software | ​ | ​ | 38,623 | ​ | ​ | 35,814
Machinery and equipment | ​ | ​ | 139,858 | ​ | ​ | 90,700
Furniture and fixtures | ​ | ​ | 7,426 | ​ | ​ | 5,806
Leasehold improvements | ​ | ​ | 52,670 | ​ | ​ | 37,495
Capital projects in process | ​ | ​ | 33,915 | ​ | ​ | 36,644
Right-of-use asset | ​ | ​ | 4,718 | ​ | ​ | 2,476
Vehicles | ​ | ​ | 1,540 | ​ | ​ | —
Property, plant and equipment, gross | ​ | ​ | 320,620 | ​ | ​ | 238,516
Less: accumulated depreciation and amortization | ​ | ​ | (114,876) | ​ | ​ | (84,046)
Property, plant and equipment, net | ​ | $ | 205,744 | ​ | $ | 154,470
​ ​ Depreciation expense, which includes amortization expense on finance leases, was $37.2 million, $21.9 million and $19.5 million, respectively, for the fiscal years ended September 30, 2023, 2022, and 2021. The Company recorded $13.5 million of additions to property, plant and equipment for which cash payments had not yet been made as of September 30, 2023. As of September 30, 2023 and 2022, the Company had cumulative capitalized direct costs of $30.5 million and $26.9 million, respectively, associated with the development of software for its internal use. As of September 30, 2023, this balance included $4.9 million associated with software still in the development stage included within "Property, plant and equipment, net" in the accompanying Consolidated Balance Sheets. During fiscal year 2023, the Company capitalized direct costs of $3.6 million associated with the development of software for its internal use.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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