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Consolidated Statements of Operations Consolidated Statements of Operations(Parenthetical) (Class C Units)	Apr. 30, 2012
Class C Units
Class C units (in shares)	13

X

- Definition

Common Stock, Shares Converted

+ References

No definition available.

+ Details

Name:	oak_CommonStockSharesConverted
Namespace Prefix:	oak_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant