Commitments, Contingencies and Off-Balance Sheet Arrangements - Commitments (Details)	3 Months Ended
Apr. 30, 2018
Commitments, Contingencies and Off-Balance Sheet Arrangements
Initial term of employment agreements	3 years
Number of additional years for which employment agreements may renew	1 year

The number of additional years for which the employment agreements may be renewed.

No definition available.

Name:	klx_AdditionalRenewalYearsEmploymentAgreementNumber
Namespace Prefix:	klx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration