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Fair Value Measurement of Assets and Liabilities (Details)
$ in Millions
Apr. 30, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Debt Instrument, Unamortized Discount (Premium), Net $ 1.1
Fair Value, Inputs, Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Foreign currency derivatives, asset $ 0.1