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Acquisitions - Allocation of Purchase Price (Details) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Liabilities assumed: |  |
Goodwill | $ 127,046 | $ 120,406
Series of Individually Immaterial Business Acquisitions |  |
Assets acquired: |  |
Inventories | 2,863 |
Property and equipment | 31,740 |
Total assets | 34,603 |
Liabilities assumed: |  |
Accrued expenses | 86 |
Total liabilities | 86 |
Net tangible assets acquired | 34,517 |
Goodwill | 6,640 |
Total consideration paid | $ 41,157 |

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