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Contractual Obligations - Summary of Contractual Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Purchase Commitments, Total	$ 15,117us-gaap_PurchaseObligation
Purchase Commitments, 2016	14,907us-gaap_PurchaseObligationDueInNextTwelveMonths
Purchase Commitments, 2017	210us-gaap_PurchaseObligationDueInSecondYear
Purchase Commitments, 2018	0us-gaap_PurchaseObligationDueInThirdYear
Purchase Commitments, 2019	0us-gaap_PurchaseObligationDueInFourthYear
Purchase Commitments, 2020 and Thereafter	0us-gaap_PurchaseObligationDueAfterFifthYear
Operating Lease Obligations, Total	688us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Operating Lease Obligations, 2016	255us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Operating Lease Obligations, 2017	225us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Operating Lease Obligations, 2018	136us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Operating Lease Obligations, 2019	72us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Operating Lease Obligations, 2020 and Thereafter	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Contractual Obligation, Total	15,805us-gaap_ContractualObligation
Contractual Obligation, 2016	15,162us-gaap_ContractualObligationDueInNextTwelveMonths
Contractual Obligation, 2017	435us-gaap_ContractualObligationDueInSecondYear
Contractual Obligation, 2018	136us-gaap_ContractualObligationDueInThirdYear
Contractual Obligation, 2019	72us-gaap_ContractualObligationDueInFourthYear
Contractual Obligation, 2020 and Thereafter	$ 0us-gaap_ContractualObligationDueAfterFifthYear

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Amount of contractual obligation maturing in the fourth fiscal year following the latest fiscal year.

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Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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