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Debt (Details 1) (London Interbank Offered Rate (LIBOR) [Member], First Lien RBL [Member])
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3 Months Ended |
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Jul. 31, 2014
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Range 1 [Member]
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| Line of Credit Facility [Line Items] | |
| Spread above LIBOR (percent) | 3.00% |
| Undrawn commitment fee rate (percent) | 0.50% |
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Range 2 [Member]
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| Line of Credit Facility [Line Items] | |
| Spread above LIBOR (percent) | 3.25% |
| Undrawn commitment fee rate (percent) | 0.50% |
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Range 3 [Member]
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| Line of Credit Facility [Line Items] | |
| Spread above LIBOR (percent) | 3.50% |
| Undrawn commitment fee rate (percent) | 0.75% |
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Range 4 [Member]
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| Line of Credit Facility [Line Items] | |
| Spread above LIBOR (percent) | 3.75% |
| Undrawn commitment fee rate (percent) | 0.75% |
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Range 5 [Member]
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| Line of Credit Facility [Line Items] | |
| Spread above LIBOR (percent) | 4.00% |
| Undrawn commitment fee rate (percent) | 0.75% |