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

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

No definition available.

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

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.

No definition available.

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

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.

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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.

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

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

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.

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

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

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.

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

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

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

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