v3.19.2

Subsequent Event (Details) - Subsequent Event - $ / shares	Jul. 31, 2019	Jul. 30, 2019
Quarterly Dividend Declared
Subsequent Event [Line Items]
Increase in dividends payable (per share)	$ 0.055
Dividends payable (per share)	0.540
Annual Dividend Declared
Subsequent Event [Line Items]
Dividends payable (per share)	$ 2.16	$ 1.94

X

- Definition

Increase (Decrease) in Dividends Payable, Per Share

+ References

No definition available.

+ Details

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Namespace Prefix:	br_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

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