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Accrued Expenses and Other Current Liabilities (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2022 | Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021 | Jul. 31, 2021
Payables and Accruals [Abstract] |  |  |  |  |  |
Minimum coverage period of product warranty from the date of shipment |  |  |  | 1 year |  |
Accrued Expenses And Other Current Liabilities [Line Items] |  |  |  |  |  |
Accrued wages and benefits related to CEO transition costs |  | $ 6,015,000 |  | $ 6,015,000 |  |
Accrued acquisition-related costs |  | 9,031,000 |  | 9,031,000 |  | $ 9,222,000
Proxy solicitation costs included in other current liabilities |  | 5,768,000 |  | 5,768,000 |  |
Cost of sales |  | (74,523,000) | $ (105,612,000) | (149,547,000) | $ (190,622,000) |
Commercial Solutions |  |  |  |  |  |
Accrued Expenses And Other Current Liabilities [Line Items] |  |  |  |  |  |
Cost of sales |  |  |  | 2,500,000 |  |
UHP |  |  |  |  |  |
Accrued Expenses And Other Current Liabilities [Line Items] |  |  |  |  |  |
Accrued acquisition-related costs |  | $ 9,000,000 |  | $ 9,000,000 |  | $ 8,705,000
Subsequent Event |  |  |  |  |  |
Accrued Expenses And Other Current Liabilities [Line Items] |  |  |  |  |  |
CEO transition costs paid | $ 5,054,000 |  |  |  |  |

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