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Subsequent Events (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jun. 30, 2013
Miscor Debt [Member]
  
Subsequent Event [Line Items]  
Subsequent Event Lower Range If MISCOR debt as measured by the Merger Agreement is lower than MISCOR debt as of the closing date, merger consideration will increase.
Subsequent Event Higher Range If MISCOR debt as measured by the Merger Agreement is higher than MISCOR debt as of the closing date, merger consideration will decrease
Collar [Member]
  
Subsequent Event [Line Items]  
Subsequent Event Lower Range If IES stock value, as defined within the Merger Agreement, is lower than the Collar, merger consideration will decrease
Subsequent Event Higher Range If IES stock value, as defined within the Merger Agreement, is higher than the Collar, merger consideration will increase
IES common stock
  
Subsequent Event [Line Items]  
Subsequent Event Lower Range If IES stock value, as defined within the Merger Agreement, is less than the stock value upon closing, merger consideration will increase.
Subsequent Event Higher Range If IES stock value, as defined within the Merger Agreement, is greater than the stock value upon closing, merger consideration will decrease
Miscor Merger [Member]
  
Subsequent Event [Line Items]  
SubsequentEventsDate Mar. 13, 2013
SubsequentEventDescription On March 13, 2013, the Company entered into the Merger Agreement with MISCOR pursuant to which IES and MISCOR agreed that, subject to the satisfaction of certain closing conditions (including the approval by each company’s stockholders), MISCOR will merge with and into IES as a direct, wholly-owned subsidiary of IES. The transaction is currently expected to close in September 2013. The Merger Agreement provides for the exchange of MISCOR common stock for the right to receive IES common stock, cash, or IES common stock and cash. However, the maximum cash consideration paid to MISCOR shareholders is limited to 50% of the total merger consideration.
SubsequentEventAmount $ 24,000
Committment Letter [Member]
  
Subsequent Event [Line Items]  
SubsequentEventsDate Apr. 10, 2013
SubsequentEventDescription the Company entered into a commitment letter with Wells Fargo, pursuant to which Wells Fargo committed to provide the Company, subject to the satisfaction of certain conditions, a new amortizing term loan in a principal amount of up to $14,000 (as amended on July 10, 2013, the “Acquisition Term Loan”) under the 2012 Credit Facility in order to finance the Merger Payments.
SubsequentEventAmount $ 14,000
Committment Letter [Member] | Less than $20,000
  
Subsequent Event [Line Items]  
Liquidity Is Less Than Liquidity ≤ $20,000 at any time during the period
Interest Rate Percentage 5.00 percentage points
Committment Letter [Member] | Greater than $20,000 but less than $30,000
  
Subsequent Event [Line Items]  
Liquidity Is Greater Than But Less Than Liquidity > $20,000 at all times during the period but Liquidity ≤ $30,000 at any time during the period
Interest Rate Percentage 4.50 percentage points
Committment Letter [Member] | Greater than $30,000
  
Subsequent Event [Line Items]  
Liquidity Is Greater Than Liquidity > $30,000 at all times during the period
Interest Rate Percentage 4.00 percentage points