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Partnership's Repurchase Activities (Parenthetical) (Detail) - shares shares in Thousands	Mar. 31, 2016	Sep. 30, 2015
Capital Unit [Line Items]
Partnership's common units authorized for repurchase	6,044
Private Transaction
Capital Unit [Line Items]
Partnership's common units authorized for repurchase	1,150	1,400

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: