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Organization and Summary of Significant Accounting Policies - Restricted Stock and Options Outstanding Used in Per Share Calculations (Detail)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Earnings Per Share, Basic and Diluted [Abstract]      
Stock options 223us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 389us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 505us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Restricted stock 26mind_IncrementalCommonSharesAttributableToRestrictedStock 25mind_IncrementalCommonSharesAttributableToRestrictedStock 22mind_IncrementalCommonSharesAttributableToRestrictedStock
Total dilutive shares 249mind_DilutiveShares 414mind_DilutiveShares 527mind_DilutiveShares