Income Taxes - Schedule of NOL and Tax Credit Valuation Allowances (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2025 |
Jul. 31, 2024 |
|
| Valuation Allowance, Deferred Tax Asset | |||
| Balance as of beginning of year | $ (30.0) | ||
| Balance as of end of year | (32.3) | $ (30.0) | |
| Net Operating Loss And Tax Credit | |||
| Valuation Allowance, Deferred Tax Asset | |||
| Balance as of beginning of year | (22.7) | (9.1) | $ (6.4) |
| Additions charged to costs and expenses | (5.2) | (14.0) | (3.6) |
| Deductions from reserves | 0.3 | 0.4 | 0.9 |
| Balance as of end of year | $ (27.6) | $ (22.7) | $ (9.1) |