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Components of Other Gains, Net (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Component Of Other Expense Income Nonoperating [Line Items]        
Foreign currency exchange gain (losses) $ (84)us-gaap_ForeignCurrencyTransactionGainLossRealized $ (537)us-gaap_ForeignCurrencyTransactionGainLossRealized $ 2,346us-gaap_ForeignCurrencyTransactionGainLossRealized $ (707)us-gaap_ForeignCurrencyTransactionGainLossRealized
Gain on disposal of assets 15us-gaap_GainLossOnDispositionOfAssets   44us-gaap_GainLossOnDispositionOfAssets 467us-gaap_GainLossOnDispositionOfAssets
Gain on Trading Securities 3,227us-gaap_TradingSecuritiesRealizedGainLoss   5,328us-gaap_TradingSecuritiesRealizedGainLoss  
Other, net 365us-gaap_OtherComprehensiveIncomeOtherNetOfTax 30us-gaap_OtherComprehensiveIncomeOtherNetOfTax (957)us-gaap_OtherComprehensiveIncomeOtherNetOfTax (76)us-gaap_OtherComprehensiveIncomeOtherNetOfTax
Other losses, net $ 3,523mlnk_OtherNonoperatingGainLoss $ (507)mlnk_OtherNonoperatingGainLoss $ 6,761mlnk_OtherNonoperatingGainLoss $ (316)mlnk_OtherNonoperatingGainLoss