Name:	ment_AccruedSpecialCharges
Namespace Prefix:	ment_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying amount as of the balance sheet date which is expected to be paid in the next twelve months.

No definition available.

Name:	ment_AccruedSpecialChargesCurrent
Namespace Prefix:	ment_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Carrying amount as of the balance sheet date which is expected to be paid after one year.

No definition available.

Name:	ment_AccruedSpecialChargesNoncurrent
Namespace Prefix:	ment_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Percentage of termination benefit paid as of the balance sheet date.

No definition available.

Name:	ment_PercentageOfTerminationBenefitPaid
Namespace Prefix:	ment_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section 45

-Paragraph 3

-Subparagraph (k)

-URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849