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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Oct. 23, 2012
Subsequent Event
Number of trading days over which average market capitalization is considered	30 days
Subsequent event | Maximum
Subsequent Event
Average market capitalization	50
Shareholders' equity	50

X

- Definition

Represents the number of trading days over which average market capitalization is considered as per listing standards.

+ References

No definition available.

+ Details

Name:	mlp_NumberOfTradingDaysStockExchangeListingStandardsAverageMarketCapitalizationPeriod
Namespace Prefix:	mlp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of average market capitalization considered as per listing standards.

+ References

No definition available.

+ Details

Name:	mlp_StockExchangeListingStandardsAverageMarketCapitalization
Namespace Prefix:	mlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the amount of shareholders' equity recently reported.

+ References

No definition available.

+ Details

Name:	mlp_StockExchangeListingStandardsShareholdersEquity
Namespace Prefix:	mlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration