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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Apr. 30, 2019
Derivative Instruments and Hedging Activities [Abstract]
Total debt outstanding	$ 797.4		$ 797.4
Unamortized debt issuance costs	0.7		0.7
Variable rate loans outstanding	798.1		798.1
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities [Abstract]
Net gain (losses) reclassified from Accumulated Other Comprehensive Loss	0.1	$ 1.3	0.6	$ 3.4
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities [Abstract]
Liabilities fair value of derivative instrument	$ 1.2		$ 1.2
Assets fair value of derivative instrument					$ 0.5
Interest Rate Swaps [Member] | August 2019 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]
Derivative Instruments and Hedging Activities [Abstract]
Inception date			Aug. 07, 2019
Fixed interest rate to be paid	1.40%		1.40%
Term of variable rate			1 month
Term of derivative instrument			3 years
Expiration date			Aug. 15, 2022
Notional amount of derivative liability	$ 100.0		$ 100.0
Interest Rate Swaps [Member] | June 2019 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]
Derivative Instruments and Hedging Activities [Abstract]
Inception date			Jun. 24, 2019
Fixed interest rate to be paid	1.65%		1.65%
Term of variable rate			1 month
Term of derivative instrument			3 years
Expiration date			Jul. 15, 2022
Notional amount of derivative liability	$ 100.0		$ 100.0
Interest Rate Swaps [Member] | April 2016 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]
Derivative Instruments and Hedging Activities [Abstract]
Inception date			Apr. 04, 2016
Fixed interest rate to be paid	0.92%		0.92%
Term of variable rate			1 month
Term of derivative instrument			3 years
Expiration date			May 15, 2019
Notional amount of derivative liability	$ 350.0		$ 350.0

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Term of the interest rate that fluctuates over time based on an underlying benchmark interest rate or index, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Nominal or face amount used to calculate payments on the derivative liability.

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Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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