XML 56 R41.htm IDEA: XBRL DOCUMENT
v3.22.4

Commitments and Contingent Liabilities (Details) - Schedule of purchased water costs - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Purchased Water Costs Abstract |  |  |
Untreated | $ 3.2 | $ 3.3 | $ 3.4
Treated | 3.9 | 3.6 | 3.6
Total Costs | $ 7.1 | $ 6.9 | $ 7.0

X
- Definition Refers to cost of treated water during the period. + References No definition available. + Details
Name: | msex_CostOfTreatedWater
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Refers to cost of untreated water during the period. + References No definition available. + Details
Name: | msex_CostOfUntreatedWater
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | msex_ScheduleOfPurchasedWaterCostsAbstract
Namespace Prefix: | msex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost of water purchased, may include any water related assessment. If water is bought on a unit volume basis, would also be considered as commodity costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_CostOfPurchasedWater
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration