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Derivative Instruments and Hedging Activities (Details) £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) Contract | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) Contract | Apr. 30, 2017 USD ($) | Oct. 31, 2016 GBP (£) Contract
Derivative [Line Items] |  |  |  |  |  |
Variable rate loans outstanding | $ 563.0 | $ 884.0 | $ 563.0 | $ 884.0 |  |
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net gain (losses) reclassified from Accumulated Other Comprehensive Loss | 0.3 | 0.4 | (0.4) | (0.9) |  |
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Assets fair value of derivative instrument | $ 3.9 |  | $ 3.9 |  | $ 3.9 |
Liability fair value of derivative instrument |  | $ 0.2 |  | $ 0.2 |  |
Interest Rate Swaps [Member] | April 2016 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Inception date |  |  | Apr. 04, 2016 |  |  |
Fixed interest rate to be paid | 0.92% |  | 0.92% |  |  |
Description of variable rate basis |  |  | one-month LIBOR |  |  |
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 |  |  |
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount of derivative liability | £ |  |  |  |  |  | £ 274
Number of open derivative contracts held | Contract |  | 1 |  | 1 |  | 1
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Transaction Gains (Losses) [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (loss) on fair value of derivative instruments |  | $ 25.4 |  | $ 64.7 |  |
Forward Exchange Contracts [Member] | Recurring [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Prepaid and Other Current Assets [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain recognized on derivative instruments |  | $ 66.0 |  | $ 66.0 |  |

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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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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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