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v3.3.1.900

Debt - Borrowing Thresholds (Details) - Revolving Loan [Member] | 12 Months Ended
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Sep. 30, 2015
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
- References No definition available. + Details
Name: | iesc_ExcessAvailabilityGreaterThanEqual
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
- References No definition available. + Details
Name: | iesc_Excessavailabilityis
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 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
- References No definition available. + Details
Name: | iesc_Liquidityisgreaterthanandlessthan
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: | us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
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: |