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Contingencies (Details) - Mentor Patent Litigation $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Oct. 10, 2014 USD ($) | Oct. 04, 2012 lawsuit patent | Jul. 31, 2018 USD ($) | Mar. 16, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Payments for legal settlements |  |  | $ 65.0 |
Release of loss contingency accrual |  |  | 39.0 |
Litigation settlement expense |  |  | $ 26.0 |
Patent cross-license |  |  | 7 years |
Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, patent infringement lawsuits | lawsuit |  | 3 |  |
Loss contingency, patents allegedly infringed | patent |  | 3 |  |
Loss contingency, value of damages sought | $ 36.0 |  |  |
Loss contingency, estimate of possible loss accrued |  |  |  | $ 39.0
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Potential one-time termination charge |  |  | $ 0.0 |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Potential one-time termination charge |  |  | $ 25.0 |

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