XML 44 R32.htm IDEA: XBRL DOCUMENT v3.10.0.1

Commitments and Contingencies (Details)		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2017 ft²	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jan. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating leases, rent expense	$ 1,500,000		$ 2,600,000	$ 2,300,000	$ 8,800,000	$ 6,600,000
Rentable office space (in sq ft) | ft²		106,230
Lease liability			800,000		800,000
Accrual for contingencies			$ 0		$ 0		$ 0

X

- Definition

Operating Leases, Net Rentable Area

+ References

No definition available.

+ Details

Name:	mdb_OperatingLeasesNetRentableArea
Namespace Prefix:	mdb_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant