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Commitments and Contingencies (Details) - USD ($) $ in Millions | Jan. 31, 2021 | Jul. 31, 2020
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Commitments and Contingencies (Details) [Line Items] |  |
Accrued expenses | $ 41.1 | $ 40.8
Purchase commitment | 1.3 |
Performance bonds outstanding | 19.8 |
Restricted cash and cash equivalents | 9.8 | $ 11.0
Federal Telecommunications Relay Services Fund [Member] |  |
Commitments and Contingencies (Details) [Line Items] |  |
Invoiced amount | 2.9 |
Universal Service Fund [Member] |  |
Commitments and Contingencies (Details) [Line Items] |  |
Invoiced amount | $ 1.8 |

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