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Income Taxes - Deferred Income Taxes - Undistributed Earnings - Narrative (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 30, 2017 | Jul. 31, 2016 | Apr. 30, 2017
Income Taxes [Line Items] |  |  |
Undistributed earnings from our foreign subsidiaries that will not be reinvested indefinitely | $ 150,800,000 | $ 134,700,000 | $ 146,900,000
Deferred tax liability, undistributed earnings from foreign subsidiaries | 810,000 | 431,000 | 497,000
U.S. income and foreign withholding taxes | 45,400,000 | 39,800,000 | 44,000,000
U.S. foreign income tax credits | $ 44,600,000 | $ 39,400,000 | 43,500,000
Unconsolidated Joint Venture [Member] | Haiti [Member] |  |  |
Income Taxes [Line Items] |  |  |
Undistributed earnings of foreign subsidiaries to be reinvested indefinitely |  |  | $ 1,800,000

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