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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Apr. 30, 2017
Financial Instrument [Line Items]
Derivative losses included in accumulated other comprehensive income				$ 0.5
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts
Financial Instrument [Line Items]
Foreign currency gains (losses)		$ 0.3	$ 0.2	(2.3)	$ 0.2
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts | Other Accrued Liabilities | Derivatives Purchased
Financial Instrument [Line Items]
Derivative notional amount		22.4		22.4		$ 19.4
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts | Other Accrued Liabilities | Derivatives Sold
Financial Instrument [Line Items]
Derivative notional amount		63.2		63.2		$ 70.0
Designated as Hedge Instrument | Interest Rate Swap | Cash Flow Hedge
Financial Instrument [Line Items]
Derivative notional amount	$ 129.8	$ 124.6		$ 124.6
Derivative, Maturity Date	Jun. 15, 2021
Interest rate	1.919%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Financial Instrument [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 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

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

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