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Balance Sheet - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Balance Sheet - Additional Information (Detail) (USD $)	Apr. 30, 2015 Customer	Jan. 31, 2015 Customer
Balance Sheet [Line Items]
Contracts and notes receivable	$ 3,201,000	$ 3,639,000
Contracts and notes receivable, Interest rate	2.20%	1.90%
Number of customers due	2mind_NumberOfCustomers	3mind_NumberOfCustomers
Allowance for contract and notes receivable		0
Minimum [Member]
Balance Sheet [Line Items]
Contracts and notes receivable repayment term	1 month
Maximum [Member]
Balance Sheet [Line Items]
Contracts and notes receivable repayment term	10 months
Promissory Note [Member]
Balance Sheet [Line Items]
Contracts and notes receivable	$ 2,370,000

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.

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