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v3.19.3

Controlling Shareholder (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 USD ($)
Risks and Uncertainties [Abstract] |
ControllingShareholderOwnershipPercentage | 58.00%
Related Party Transaction, Purchases from Related Party | $ 8

X
- Definition Percentage of outstanding common stock owned by controlling shareholder + References No definition available. + Details
Name: | iesc_ControllingShareholderOwnershipPercentage
Namespace Prefix: | iesc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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