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Debt - Borrowing Thresholds (Details) | 12 Months Ended
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Sep. 30, 2016
Level I |
Debt Instrument [Line Items] |
Liquidity is less than at any time during the period | If Liquidity is less than $24,500 at any time during the period
Percentage Points | 2.25 percentage points
Level II |
Debt Instrument [Line Items] |
Liquidity is greater than or equal to at all times and less than at any time. | If Liquidity is greater than or equal to $24,500 at all times during the period and less than $35,000 at any time during the period
Percentage Points | 2.00 percentage points
Level III |
Debt Instrument [Line Items] |
Liquidity is greater than or equal to at all times during the period | If Liquidity is greater than or equal to $35,000 at all times during the period
Percentage Points | 1.75 percentage points

X
- Definition The amount of Liquidity as established by the borrowing thresholds. + References No definition available. + Details
Name: | iesc_LiquidityGreaterThan
Namespace Prefix: | iesc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The amount of Liquidity as established by the borrowing thresholds. + References No definition available. + Details
Name: | iesc_LiquidityIsLessThan
Namespace Prefix: | iesc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points assessed to each level of the borrowing thresholds. + References No definition available. + Details
Name: | iesc_PercentagePoints
Namespace Prefix: | iesc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | iesc_DebtInstrumentUnusedBorrowingCapacityAxis=iesc_Level1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | iesc_DebtInstrumentUnusedBorrowingCapacityAxis=iesc_Level2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | iesc_DebtInstrumentUnusedBorrowingCapacityAxis=iesc_Level3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |