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Financial Instruments and Risk Management (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Mar. 24, 2012
Mar. 26, 2011
Sep. 24, 2011
Sep. 25, 2010
Sep. 26, 2009
Asset Fair Value Measurement Using Significant Unobservable Inputs (Level 3) [Roll Forward]          
Beginning balance of over-the-counter options $ 1,780 $ 1,509 $ 1,509 $ 1,675  
Beginning balance realized during the period (398) (833) (1,509) (1,434)  
Change in the fair value of beginning balance (770) (41) 0 (241)  
Contracts purchased during the period 330 475 1,780 1,509  
Ending balance of over-the-counter options 942 1,110 1,780 1,509  
Liability Fair Value Measurement Using Significant Unobservable Inputs (Level 3) [Roll Forward]          
Beginning balance of over-the-counter options 118 29 29 844  
Beginning balance realized during the period 0 (11) (29) (844)  
Change in the fair value of beginning balance (97) (18) 0 0  
Contracts purchased during the period 0 0 118 29  
Ending balance of over-the-counter options 21 0 118 29  
Derivative Instruments and Hedging Activities [Abstract]          
Period over which partnership's outstanding commodity-related derivatives were scheduled to mature (in months)     15M    
Weighted average maturity of outstanding commodity-related derivatives (in months) 5M   4M 3M  
Credit Risk [Abstract]          
Number of locations served by the Partnership     300    
Number of states which the Partnership operates     30    
Minimum concentration risk threshold accounted for by a single customer (in hundredths)     10.00% 10.00% 10.00%
Number of suppliers providing a concentration of propane supplies     3    
Concentration percentage of propane supply provided by suppliers (in hundredths)     37.00% 38.00% 40.00%
Bank Debt and Senior Notes [Abstract]          
Fair Value of Senior Notes 270,000   248,500    
Designated as Hedging Instrument [Member]
         
Derivatives, Fair Value [Line Items]          
Fair value - liabilities 3,637   4,596 6,301  
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
         
Derivatives, Fair Value [Line Items]          
Fair value - liabilities 999   1,934 3,561  
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Current Liabilities [Member]
         
Derivatives, Fair Value [Line Items]          
Fair value - liabilities 2,638   2,662 2,740  
Not Designated as Hedging Instrument [Member]
         
Derivatives, Fair Value [Line Items]          
Fair Value - assets 1,282   5,454 2,623  
Fair value - liabilities 31   2,476 2,479  
Not Designated as Hedging Instrument [Member] | Commodity Options [Member] | Other Liabilities [Member]
         
Derivatives, Fair Value [Line Items]          
Fair value - liabilities 0   69 0  
Not Designated as Hedging Instrument [Member] | Commodity Options [Member] | Other Current Liabilities [Member]
         
Derivatives, Fair Value [Line Items]          
Fair value - liabilities 31   2,407 641  
Not Designated as Hedging Instrument [Member] | Commodity Options [Member] | Other Current Assets [Member]
         
Derivatives, Fair Value [Line Items]          
Fair Value - assets 1,083   3,710 2,601  
Not Designated as Hedging Instrument [Member] | Commodity Options [Member] | Other Assets [Member]
         
Derivatives, Fair Value [Line Items]          
Fair Value - assets 0   612 0  
Not Designated as Hedging Instrument [Member] | Commodity Futures [Member] | Other Current Liabilities [Member]
         
Derivatives, Fair Value [Line Items]          
Fair value - liabilities     0 1,838  
Not Designated as Hedging Instrument [Member] | Commodity Futures [Member] | Other Current Assets [Member]
         
Derivatives, Fair Value [Line Items]          
Fair Value - assets 199   1,132 22  
Not Designated as Hedging Instrument [Member] | Commodity Futures [Member] | Other Assets [Member]
         
Derivatives, Fair Value [Line Items]          
Fair Value - assets     $ 0 $ 0