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Debt - Schedule of Future Principal Repayments of Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Capital Lease  
2015 $ 641us-gaap_CapitalLeasesFutureMinimumPaymentsRemainderOfFiscalYear [1]
2016 511us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears [1]
2017 93us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears [1]
2018 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears [1]
2019 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears [1]
Capital Lease 1,245us-gaap_CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1 [1]
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]  
2015 1,016us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
2016 1,261us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo
2017 1,093us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree
2018 1,000us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour
2019 6,750us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive
Total 11,120us-gaap_LongTermDebtAndCapitalLeaseObligations
Senior Notes  
Senior Term Loan  
2015 375us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
2016 750us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
2017 1,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
2018 1,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
2019 6,750us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Long-term Debt $ 9,875us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
[1] Future minimum lease payments include principal plus interest.