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Contracts and Notes Receivable - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2015 Customer | Jan. 31, 2014 Customer
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Contracts and notes receivable | $ 3,639,000 us-gaap_NotesAndLoansReceivableNetCurrent | $ 1,005,000 us-gaap_NotesAndLoansReceivableNetCurrent
Contracts and notes receivable, Interest rate | 1.90%us-gaap_ContractReceivableDueAfterOneYearWeightedAverageInterestRate | 8.50%us-gaap_ContractReceivableDueAfterOneYearWeightedAverageInterestRate
Number of customers due | 3 mind_NumberOfCustomers | 3 mind_NumberOfCustomers
Allowance for contract and notes receivable | $ 0 us-gaap_FinancingReceivableAllowanceForCreditLosses |
Maximum [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Contracts and notes receivable repayment term | 10 months | 8 months
Minimum [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Contracts and notes receivable repayment term | 1 month | 2 months

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- Definition Contracts receivable repayment term. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of customers. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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- Definition The weighted average interest rate charged on contract receivables maturing after one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49354-109356 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4531-111522 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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