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Term Receivable and Trade Accounts Receivable Balances (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Jan. 31, 2014
Accounts and Financing Receivable [Line Items]    
Trade accounts receivable, net $ 546,622us-gaap_AccountsReceivableNetCurrent $ 454,483us-gaap_AccountsReceivableNetCurrent
Term receivables, long-term 301,862us-gaap_AccountsReceivableNetNoncurrent 270,365us-gaap_AccountsReceivableNetNoncurrent
Trade accounts receivable    
Accounts and Financing Receivable [Line Items]    
Trade accounts receivable, net 208,996us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember		 179,830us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
Term receivables, short-term    
Accounts and Financing Receivable [Line Items]    
Trade accounts receivable, net $ 337,626us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ment_TermReceivabesCurrentMember		 $ 274,653us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ment_TermReceivabesCurrentMember