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Contingencies and Commitments (Details) - Civil lawsuit - Verdict received $ in Millions | 12 Months Ended
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Apr. 30, 2016 USD ($)
Contingencies and Commitments |
Litigation expense, excluding internal and external legal fees | $ 5.5
Accrued expenses and other current liabilities |
Contingencies and Commitments |
Accrual recorded on the balance sheet | $ 5.5

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