401(k) PLAN (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
401(k) PLAN
Maximum percentage of compensation the plan participants may defer (as a percent)	25.00%
Percentage of employer contribution of first 6 percent of eligible compensation deferred by employee (as a percent)	50.00%
Maximum percentage eligible compensation, 50% matched (as a percent)	6.00%
Matching contributions made by the employer	$ 1.9	$ 1.9	$ 1.9
Percentage of employer contribution vested immediately for employees hired through December 31, 2000 (as a percent)	100.00%
Percentage of employer contribution vesting annually for employees hired on or after January 1, 2001 (as a percent)	20.00%
Vesting period of employer match, for employees hired on or after January 1, 2001 (in years)	5
Percentage of employer contribution vesting annually for employees effective October 1, 2005 (as a percent)	25.00%
Vesting period of employer match, effective October 1, 2005 (in years)	4

Represents the employer match vesting schedule effective October 1, 2005.

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Namespace Prefix:	byi
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the employer match vesting schedule for employees hired on or after January 1, 2001.

+ Details

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Namespace Prefix:	byi
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the maximum percentage of employee deferred compensation under the plan subject to employer 50% match.

+ Details

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Namespace Prefix:	byi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the maximum percentage of compensation the plan participants may defer.

+ Details

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Namespace Prefix:	byi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of matching contribution by the Company vested immediately under the 401(k) plan for participants hired through December 31, 2000.

+ Details

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Namespace Prefix:	byi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of matching contribution by the Company vesting annually under the 401(k) plan for participants effective 1st October, 2005.

+ Details

Name:	byi_PercentageOfEmployerMatchingContributionByCompanyForParticipantsEffective1stOctober2005
Namespace Prefix:	byi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of matching contribution by the Company vesting annually under the 401(k) plan for participants hired on or after January 1, 2001.

+ Details

Name:	byi_PercentageOfEmployerMatchingContributionByCompanyForParticipantsHiredOnOrAfter1stJanuary2001
Namespace Prefix:	byi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer matching contribution when employee contribution is up to the first 6% of their compensation.

+ Details

Name:	byi_PercentageOfMatchingContributionMadeByCompany
Namespace Prefix:	byi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 11
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration