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Fair Value of Financial Instruments (Details 2)
$ in Thousands
Apr. 30, 2020
USD ($)
investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Less than Twelve Months, Fair Value $ 148,467
Less than 12 Months, Aggregate Losses (687)
Twelve Months or Longer, Fair Value 0
12 Months or Longer, Aggregate Losses 0
Fair Value 148,467
Aggregate Losses $ (687)
Number of Positions | investment 41
U.S. Government agency securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Less than Twelve Months, Fair Value $ 61,828
Less than 12 Months, Aggregate Losses (107)
Twelve Months or Longer, Fair Value 0
12 Months or Longer, Aggregate Losses 0
Fair Value 61,828
Aggregate Losses (107)
Corporate bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Less than Twelve Months, Fair Value 80,295
Less than 12 Months, Aggregate Losses (561)
Twelve Months or Longer, Fair Value 0
12 Months or Longer, Aggregate Losses 0
Fair Value 80,295
Aggregate Losses (561)
Asset-backed securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Less than Twelve Months, Fair Value 1,478
Less than 12 Months, Aggregate Losses (18)
Twelve Months or Longer, Fair Value 0
12 Months or Longer, Aggregate Losses 0
Fair Value 1,478
Aggregate Losses (18)
Foreign government bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Less than Twelve Months, Fair Value 4,866
Less than 12 Months, Aggregate Losses (1)
Twelve Months or Longer, Fair Value 0
12 Months or Longer, Aggregate Losses 0
Fair Value 4,866
Aggregate Losses $ (1)