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Basis of Presentation and Significant Accounting Policies - Concentrations of Credit Risk - Additional Information (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 USD ($) Customer | Sep. 30, 2025 USD ($) Customer
Concentration Risk [Line Items] |  |
Number of customers represented 10% of accounts receivable | Customer | 1 | 2
Percentage of cash balances | 93.00% | 75.00%
Investment, Type [Extensible Enumeration] | U S Treasuries And F D I C Insured [Member] | U S Treasuries And F D I C Insured [Member]
Amtech's |  |
Concentration Risk [Line Items] |  |
Cash Insured Limits | $ | $ 74.9 | $ 12.0
Accounts Receivable | Customer Concentration Risk | Customer One |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 13.00% | 15.00%
Accounts Receivable | Customer Concentration Risk | Customer Two |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage |  | 13.00%

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