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Debt - Borrowing Thresholds (Details) (2012 Credit Facility [Member]) | 12 Months Ended
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Sep. 30, 2014
Level I |
Debt Instrument [Line Items] |
Liquidity is less than or equal to at any time during the period | Liquidity ≤ $20,000 at any time during the period
Excess Availability is less than or equal to at any time during the period | Excess Availability ≤ $7,500 at any time during the period
Fixed charge coverage ratio is less than | Fixed charge coverage ratio < 1.0:1.0
Percentage Points | 3.00 percentage points
Level II |
Debt Instrument [Line Items] |
Liquidity is greater than and less than or equal to | Liquidity > $20,000 at all times during the period; and Liquidity ≤ $30,000 at any time during the period; and
Fixed charge coverage is greater than or equal to | Fixed charge coverage ratio ≥ 1.0:1.0
Percentage Points | 2.50 percentage points
Excess Availability Is Equal To | Excess Availability $7,500
Level III |
Debt Instrument [Line Items] |
Liquidity is greater than at all times during the period | Liquidity > $30,000 at all times during the period
Excess Availability is greater than | Excess Availability > $7,500
Fixed charge coverage is greater than or equal to | Fixed charge coverage ratio ≥ 1.0:1.0
Percentage Points | 2.00 percentage points

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

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

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

X
- Definition The fixed charge coverage ratio as established by the borrowing thresholds. + References No definition available. + Details
Name: | iesc_FixedChargeCoverageRatioGreaterThanEqual
Namespace Prefix: | iesc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fixed charge coverage ratio as established by the borrowing thresholds. + References No definition available. + Details
Name: | iesc_FixedChargeCoverageRatioLessThan
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_LiquidityGreaterThan
Namespace Prefix: | iesc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + 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_LiquidityLessThanEqual
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
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration