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Derivative Instruments and Activities (Details) € in Millions, £ in Millions, $ in Millions	12 Months Ended
	Apr. 30, 2017 USD ($)	Apr. 30, 2016 USD ($) Contract	Apr. 30, 2015 USD ($)	Apr. 30, 2016 EUR (€) Contract	Apr. 30, 2016 GBP (£) Contract
Derivative [Line Items]
Variable rate loans outstanding	$ 365.0
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Unrecognized loss to be reclassified into net income in the next twelve months	0.8
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative [Line Items]
Net losses reclassified from Accumulated Other Comprehensive Loss	1.1	$ 0.9	$ 1.7
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
Liability fair value of derivative instrument		0.6
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Accrued Liabilities [Member]
Derivative [Line Items]
Liability fair value of derivative instrument		0.1
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Long-Term Liabilities [Member]
Derivative [Line Items]
Liability fair value of derivative instrument		$ 0.5
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%
Description of variable rate basis	one-month LIBOR
Term of derivative instrument	3 years
Expiration date	May 15, 2019
Notional amount of derivative liability	$ 350.0
Interest Rate Swaps [Member] | August 2014 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]
Derivative [Line Items]
Inception date	Aug. 15, 2014
Fixed interest rate to be paid	0.65%
Description of variable rate basis	one-month LIBOR
Term of derivative instrument	2 years
Expiration date	Aug. 15, 2016
Notional amount of derivative liability	$ 150.0
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of open derivative contracts held | Contract		2		2	2
Notional amount of derivative liability				€ 31	£ 274
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Transaction Gains (Losses) [Member]
Derivative [Line Items]
Gains (losses) recognized on derivative instruments	59.0	$ 1.3	$ (11.2)
Forward Exchange Contracts [Member] | Recurring [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Prepaid and Other Current Assets [Member]
Derivative [Line Items]
Gains (losses) recognized on derivative instruments	$ 1.3

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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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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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