Fair Value Measurements (Details) - Fair Value, Inputs, Level 2 $ in Millions |
Apr. 30, 2019
USD ($)
|
|---|---|
| Long-term Debt | |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Debt instrument, fair value disclosure | $ 274.0 |
| Debt carrying value | 275.0 |
| Long-Term Debt, Variable Interest Rate | |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Debt instrument, fair value disclosure | $ 369.4 |