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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
Jul. 13, 2012
Pipeline
Sep. 30, 2012
Pipeline
Sep. 30, 2011
Sep. 30, 2010
Significant Accounting Policies [Line Items]        
Number of pipelines acquired 2 2    
Date of acquisition   Jul. 13, 2011    
Operating and administrative expenses   $ 44.3 $ 35.6 $ 33.9
Amounts capitalized for cost of funds used in construction   5.3 8.7 6.4
Indebtedness extinguished   152.8    
Operating Administrative And Overhead Cost   12.3 9.8  
Amounts of Property Tax Receivable   5.7 2.4  
Prepaid Taxes   1.7 1.5  
Construction Payable   40.3 15.4  
Unit-based compensation charges   6.5 1.8 3.5
Prepaid expenses and other current assets
        
Significant Accounting Policies [Line Items]        
Amounts of Property Tax Receivable   2.0    
Insurance Settlements Receivable, Current   0.7    
Other long term assets [Member]
        
Significant Accounting Policies [Line Items]        
Amounts of Property Tax Receivable   3.7    
Accrued expenses
        
Significant Accounting Policies [Line Items]        
Construction Payable   39.4 9.1  
Accounts payable
        
Significant Accounting Policies [Line Items]        
Construction Payable   0.9 6.3  
Hub services
        
Significant Accounting Policies [Line Items]        
Expected insurance recoveries   1.1    
Storage Related Costs
        
Significant Accounting Policies [Line Items]        
Expected insurance recoveries   3.4    
Property plant and equipment
        
Significant Accounting Policies [Line Items]        
Expected insurance recoveries   2.1    
Revenue
        
Significant Accounting Policies [Line Items]        
Percentage of concentration of risk   10.00%    
Revenue | Con Edison
        
Significant Accounting Policies [Line Items]        
Percentage of concentration of risk   14.00% 16.00% 18.00%
Accounts Receivable | Con Edison
        
Significant Accounting Policies [Line Items]        
Percentage of concentration of risk   11.00% 13.00%  
Inergy | Restricted units
        
Significant Accounting Policies [Line Items]        
Unit-based compensation charges   5.8    
Inergy Midstream | Restricted units
        
Significant Accounting Policies [Line Items]        
Unit-based compensation charges   $ 0.7