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Balance Sheet Details (Tables)
 12 Months Ended
Sep. 30, 2023
Balance Sheet Details [Abstract]  
Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of the Company’s cash and cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash shown in the Company’s consolidated statements of cash flows for the periods presented (in thousands):
 September 30,
 20232022
Cash and cash equivalents$797,163 $758,012 
Restricted cash included in other assets, net3,672 4,195 
Total cash, cash equivalents and restricted cash$800,835 $762,207 
Inventories
Inventories consist of the following (in thousands):
 
 September 30,
 20232022
Finished goods$11,699 $10,164 
Raw materials24,175 58,201 
$35,874 $68,365 
Other Current Assets
Other current assets consist of the following (in thousands):
 September 30,
 20232022
Unbilled receivables$374,113 $319,707 
Prepaid expenses84,506 57,340 
Capitalized contract acquisition costs31,206 34,658 
Other1
64,919 77,609 
$554,744 $489,314 
(1)     As of September 30, 2023 and 2022, includes a deposit of $36.2 million and $57.0 million, respectively, used to support the working capital needs of the Company’s primary contract manufacturer's procurement of components used in the manufacturing of system hardware.
Property, Plant and Equipment
Property and Equipment
Property and equipment are stated at net book value. Depreciation of property and equipment is provided using the straight-line method over the estimated useful lives of the assets, ranging from two to five years. Leasehold improvements are amortized over the lesser of the remaining lease term or the estimated useful life of the improvements. The cost of normal maintenance and repairs is charged to expense as incurred and expenditures for major improvements are capitalized at cost. Gains or losses on the disposition of assets are reflected in the consolidated income statements at the time of disposal.
Property and equipment consist of the following (in thousands):
 September 30,
 20232022
Computer equipment$189,555 $168,204 
Software78,184 86,036 
Office furniture and equipment44,525 41,619 
Leasehold improvements185,225 173,689 
497,489 469,548 
Accumulated depreciation and amortization(327,067)(301,366)
$170,422 $168,182 
Goodwill
Changes in the carrying amount of goodwill during fiscal years 2023 and 2022 are summarized as follows (in thousands):
Balance, September 30, 2021$2,216,553 
Acquisition of Threat Stack, Inc.43,956 
Other(1,227)
Balance, September 30, 20222,259,282 
Other business acquisitions29,396 
Balance, September 30, 2023$2,288,678 
Other Assets
Other assets consist of the following (in thousands):
 September 30,
 20232022
Intangible assets$150,969 $200,288 
Unbilled receivables202,838 224,780 
Capitalized contract acquisition costs35,263 42,561 
Other55,543 48,493 
$444,613 $516,122 
Intangible Assets
Intangible assets are included in other assets on the consolidated balance sheets and consist of the following (in thousands):
 September 30, 2023September 30, 2022
 Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Developed technology
$319,368 $(190,135)$129,233 $319,436 $(151,332)$168,104 
Customer relationships
45,642 (33,298)12,344 46,142 (25,630)20,512 
Patents and trademarks
13,699 (9,658)4,041 23,504 (19,255)4,249 
Trade names
15,473 (10,122)5,351 24,973 (17,550)7,423 
Non-compete covenants
1,960 (1,960)— 2,260 (2,260)— 
$396,142 $(245,173)$150,969 $416,315 $(216,027)$200,288 
Estimated Amortization Expense For Intangible Assets
For intangible assets held as of September 30, 2023, amortization expense for the five succeeding fiscal years is as follows (in thousands):
2024$50,914 
202539,477 
202634,723 
202716,541 
20284,106 
$145,761 
Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
 September 30,
 20232022
Payroll and benefits$152,898 $165,437 
Operating lease liabilities, current41,421 42,523 
Income and other tax accruals34,504 41,217 
Other54,067 60,642 
$282,890 $309,819 
Other Long-term Liabilities
Other long-term liabilities consist of the following (in thousands):
 September 30,
 20232022
Income taxes payable$73,751 $59,553 
Other8,822 8,157 
$82,573 $67,710