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Partnership's Repurchase Activities (Parenthetical) (Detail) (Plan III Common Units Repurchase Program) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013
Plan III Common Units Repurchase Program |
Capital Unit [Line Items] |
Repurchase of Common units acquired in a private transaction | 1.15

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- Definition Number Of Repurchased Units Acquired In Private Transaction + References No definition available. + Details
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Namespace Prefix: | sgu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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