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BUSINESS SEGMENT AND OTHER OPERATIONS DATA, RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 3,158,804 $ 3,004,783 $ 2,770,005
Natural Gas Distribution [Member]
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 2,143,684 2,094,940 2,005,520
Energy Services [Member]
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 457,080 468,096 347,406
Clean Energy Ventures [Member]
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 380,707 253,663 223,247
Midstream [Member]
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 153,891 153,536 157,779
Categorized Business Segments [Member]
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 3,135,362 2,970,235 2,733,952
Retail and Other [Member]
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 82,413 85,293 73,298
Intercompany Assets [Member]
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ (58,971) [1] $ (50,745) [1] $ (37,245) [1]
[1] Consists of transactions between subsidiaries that are eliminated and reclassified in consolidation.