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Partnership's Repurchase Activities (Parenthetical) (Detail) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Capital Unit [Line Items] |  |
Partnership's common units authorized for repurchase | 6,044 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |
Private Transaction |  |
Capital Unit [Line Items] |  |
Partnership's common units authorized for repurchase | 1,150 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_PrivateTransactionMember | 1,450 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_PrivateTransactionMember

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- Details
Name: | us-gaap_CapitalUnitLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=sgu_PrivateTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |