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Commitments and Contingencies - Schedule of Expected Payments for Succeeding Year (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013
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Environmental Liabilities [Line Items] |
2014 | $ 225
2015 | 3,368
2016 | 661
2017 | 26
2018 | 42
Thereafter | 750
Total | $ 5,072

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