Related Party Transactions (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Raw materials purchased from related party investor		$ 0	$ 4,400	$ 6,800
Revenues (less than in 2025)	[1]	376,572	312,974	245,109
Accounts payable		11,094	1,630
Accounts receivable, net	[2]	57,019	34,903
Sublease income		1,068	0
Investment in equity securities	[3]	54,337	1,525
Prepaid expenses and other current assets	[4]	15,204	11,396
Interest income		0
Other non-current liabilities	[5]	747	407
Related Party
Related Party Transaction [Line Items]
Revenues (less than in 2025)		12,200	12,100	5,900
Accounts payable		0	0	0
Accounts receivable, net		1,300	500
Sublease income		1,100	0	$ 0
Investment in equity securities		53,900	0
Prepaid expenses and other current assets		300	0
Financing receivable, after allowance for credit loss, noncurrent		1,800	0
Other non-current liabilities		200	$ 0
Related Party | Atlas Data Storage, Inc
Related Party Transaction [Line Items]
Revenues (less than in 2025)		$ 100

[1] Including revenues from related parties of $12.2 million, $12.1 million and $5.9 million during the year end September 30, 2025, 2024 and 2023, respectively.

[2] Including related parties' balances of $1.3 million and $0.5 million as of September 30, 2025 and 2024, respectively.

[3] Including related party balances of $53.9 million and $— million as of September 30, 2025 and 2024, respectively.

[4] Including related party balances of $0.3 million and $— million as of September 30, 2025 and 2024, respectively.

[5] Including related party balances of $0.2 million and $— million as of September 30, 2025 and 2024, respectively.