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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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- Definition 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. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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