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Contingencies (Details) $ in Millions | 26 Months Ended |
--- | --- | ---
Apr. 30, 2017 action | Jul. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |
Number of putative class action complaints filed (over) | action | 50 |
Litigation Settlement, Amount | $ |  | $ 3.0

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