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Term Receivable and Trade Accounts Receivable Balances (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Accounts and Financing Receivable [Line Items]    
Trade accounts receivable, net $ 437,930us-gaap_AccountsReceivableNetCurrent $ 546,622us-gaap_AccountsReceivableNetCurrent
Term receivables, long-term 282,343us-gaap_AccountsReceivableNetNoncurrent 301,862us-gaap_AccountsReceivableNetNoncurrent
Trade accounts receivable    
Accounts and Financing Receivable [Line Items]    
Trade accounts receivable, net 90,050us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember		 208,996us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
Term receivables, short-term    
Accounts and Financing Receivable [Line Items]    
Trade accounts receivable, net $ 347,880us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ment_TermReceivabesCurrentMember		 $ 337,626us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ment_TermReceivabesCurrentMember