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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] $ in Thousands | Apr. 30, 2018 USD ($)
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Assets: |  |
Foreign currency forward contracts | $ 3,213 | [1]
Total assets at fair value | 3,213 |
Liabilities: |  |
Deferred compensation plans | 11,796 | [2]
Foreign currency forward contracts | 5,494 | [1]
Total liabilities at fair value | 17,290 |
Level 2 [Member] |  |
Assets: |  |
Foreign currency forward contracts | 3,213 | [1]
Total assets at fair value | 3,213 |
Liabilities: |  |
Deferred compensation plans | 11,796 | [2]
Foreign currency forward contracts | 5,494 | [1]
Total liabilities at fair value | $ 17,290 |
[1] | We enter into foreign currency forward contracts to reduce the risk of foreign currency exposures resulting from receivables, payables, intercompany receivables, intercompany payables and loans denominated in foreign currencies. Foreign currency forward contracts are valued using market exchange rates. Foreign currency forward contracts are not designated as hedges. Foreign currency forward contracts in an asset position are classified in Receivables-net and foreign currency forward contracts in a liability position are classified in Accrued liabilities on the Consolidated Balance Sheets.
[2] | Executive officers and other highly compensated employees may defer up to 100% of their salary and annual cash incentive award and for executive officers, up to 90% of their long-term performance share incentive award, into various non-qualified deferred compensation plans. Deferrals can be allocated to various market performance measurement funds. Changes in the value of compensation deferred under these plans are recognized each period based on the fair value of the underlying measurement funds.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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