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Intangibles (Schedule of Intangible Assets) (Details) $ in Thousands | 3 Months Ended
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Jul. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items] |
Accumulated Amortization | $ 28,583
Net Carrying Amount | $ 255,417
Customer relationships |
Finite-Lived Intangible Assets [Line Items] |
Weighted Average Amortization Period | 6 years
Cost | $ 274,000
Accumulated Amortization | 26,639
Net Carrying Amount | $ 247,361
Trademarks |
Finite-Lived Intangible Assets [Line Items] |
Weighted Average Amortization Period | 3 years
Cost | $ 10,000
Accumulated Amortization | 1,944
Net Carrying Amount | $ 8,056

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