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Per Share Information EPS (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Continuing operations    
Net earnings attributable to common shareholders $ 3,471iesc_Continuingnetincomelossavailabletocommonstockholdersbasic $ 264iesc_Continuingnetincomelossavailabletocommonstockholdersbasic
Net earnings attributable to restricted shareholders 2iesc_Continuingnetincomelossavailabletocommonstockholdersdiluted 1iesc_Continuingnetincomelossavailabletocommonstockholdersdiluted
Net earnings from continuing operations 3,473us-gaap_IncomeLossFromContinuingOperations 265us-gaap_IncomeLossFromContinuingOperations
Discontinued operations    
Net loss from discontinued operations attributable to common shareholders (181)iesc_Discontinuednetincomelossavailabletocommonstockholdersbasic (141)iesc_Discontinuednetincomelossavailabletocommonstockholdersbasic
Net earnings (loss) attributable to restricted shareholders 0iesc_Discontinuednetincomelossavailabletocommonstockholdersdiluted 0iesc_Discontinuednetincomelossavailabletocommonstockholdersdiluted
Net loss from discontinued operations (181)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (141)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net earnings attributable to common shareholders 3,290us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 123us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net earnings attributable to restricted shareholders 2us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 1us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Net income $ 3,292us-gaap_NetIncomeLoss $ 124us-gaap_NetIncomeLoss
Weighted Average Number of Shares Outstanding, Basic 21,734,591us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,423,397us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock options and non-vested restricted stock 45,137us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 84,353us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted Average Number of Shares Outstanding, Diluted 21,779,728us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,507,750us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share:    
From continuing operations $ 0.16us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.01us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
From discontinued operations $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic earnings per share $ 0.15us-gaap_EarningsPerShareBasic $ 0.01us-gaap_EarningsPerShareBasic
Diluted earnings per share:    
From continuing operations $ 0.16us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.01us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
From discontinued operations $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted earnings per share $ 0.15us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted