v2.4.0.6

Fair Value Of Financial Instruments (Schedule Of Changes In Level 3 Financial Assets) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Beginning balance, |  | $ 20.6
Net realized/unrealized gains/(losses) |  |
Purchases/(sales) |  |
Transfers in/(out) of Level 3 |  | $ (20.6)

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value + References No definition available. + Details
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Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases And Sales + References No definition available. + Details
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Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Transfers Out Of Level Three + References No definition available. + Details
Name: | br_TransfersOutOfLevelThree
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of realized and unrealized gains, included in the income statement for the period, from certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) and which the entity has or had based its calculation of fair market value on unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration