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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Litigation Settlement, Expense |  | $ 3,300 |  | $ 3,300 |
Class Action In United States District Court [Member] |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | $ 3,300

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_LitigationCaseAxis=mlab_ClassActionInUnitedStatesDistrictCourtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |