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Derivatives and Hedging - Additional Information (Detail) | Oct. 31, 2017 USD ($) CrossCurrencySwap | Nov. 30, 2017 USD ($) ForwardContract | Oct. 31, 2017 EUR (€) CrossCurrencySwap | May 31, 2017 USD ($)
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Derivatives Not Designated as Hedges |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |
Number of foreign currency forward contracts held | ForwardContract |  | 3 |  |
Forward Contracts Held to Sell International Currencies |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |
Notional amount |  | $ 14,600,000 |  | $ 9,800,000
Forward Contracts Held to Purchase Foreign Currencies | Derivatives Not Designated as Hedges |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |
Notional amount |  | $ 151,700,000 |  | $ 49,400,000
Net Investment Hedge |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |
Number of cross currency swaps executed | CrossCurrencySwap | 2 |  | 2 |
Notional amount | $ 100,000,000 |  | € 85,250,000 |
Derivative instruments maturity date | 2022-11 |  |  |

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- 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 + Details
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