SHARE-BASED COMPENSATION (Details 2) (USD $) In Thousands, except Per Share data	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Exercises under all share-based payment arrangements
Total intrinsic value of exercises under all share-based payments arrangements	$ 37,915	$ 59,583	$ 7,297
Cash received from exercises under all share-based payments arrangements	26,314	30,074	9,628
Tax benefit realized from exercises under all share-based payments arrangements	8,718	16,730	688
Shares reserved for stock options and RSUs issued and available for issue under the Plans and the 2008 ESPP:
Stock options and RSUs issued and currently outstanding (in shares)	4,282
Shares available for future issuance (in shares)	3,230
Total (in shares)	7,512
Stock options
Weighted average grant-date fair value per share:
Stock options granted (in dollars per share)	$ 16.86	$ 19.56	$ 10.62
Stock options vested (in dollars per share)	$ 11.47	$ 10.71	$ 9.23
Total grant-date fair value of stock options vested	6,458	7,123	13,186
Restricted stock and RSUs
Weighted average grant-date fair value per share:
Restricted stock and units vested (in dollars per share)	$ 33.31	$ 29.99	$ 20.16
Total grant-date fair value of restricted stock and RSUs vested	$ 8,962	$ 4,384	$ 3,758

Aggregate proceeds received by the entity during the annual period from exercises of awards granted under equity-based payment arrangements.

Name:	byi_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfAwardsUnderAllPlans
Namespace Prefix:	byi
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock-based awards and the conversion of similar instruments during the annual period.

+ Details

Name:	byi_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExercisesOfShareBasedAwards
Namespace Prefix:	byi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on awards which were exercised (or share units converted) into shares during the reporting period under the plan.

+ Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardAllAwardsExercisesInPeriodTotalIntrinsicValue
Namespace Prefix:	byi
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisesUnderShareBasedPaymentArrangementsAbstract
Namespace Prefix:	byi
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodWeightedAverageGrantDateFairValuePerShareAbstract
Namespace Prefix:	byi
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The total fair value of equity-based awards vested during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodGrantDateFairValue
Namespace Prefix:	byi
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The weighted average grant-date fair value of options vested during the reporting period as calculated by applying the disclosed option pricing methodology.

+ Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	byi
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the stock options and RSUs issued under the plans that validly exist and are outstanding as of the balance sheet date.

+ Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstanding
Namespace Prefix:	byi
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesReservedAbstract
Namespace Prefix:	byi
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the total shares which are reserved for stock options issued and available for issue under the Plans and the 2008 ESPP.

+ Details

Name:	byi_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesReservedTotal
Namespace Prefix:	byi
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(2)
-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 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(d)
-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 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(1)
-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 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration