Name:	kub_CapitalLeasesNetInvestmentInLeasesDeferredIncome
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

A valuation allowance for finance lease receivables that are expected to be uncollectible.

No definition available.

Name:	kub_FinanceLeaseReceivableAllowanceForCreditLosses
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Reflects the aggregate carrying amount of current and non-current finance lease receivables.

No definition available.

Name:	kub_FinanceLeaseReceivableGross
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the aggregate carrying amount of current and non-current finance lease receivables, net of unearned income and the allowance for credit losses.

No definition available.

Name:	kub_FinanceLeaseReceivableNet
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the aggregate carrying amount of retail loan and finance lease receivables, net of unearned income and the allowance for losses. These are to be collected within one year from the balance sheet date.

No definition available.

Name:	kub_FinanceReceivablesCurrent
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the aggregate carrying amount of current and non-current retail loan and finance lease receivables, net of unearned income and the allowance for losses.

No definition available.

Name:	kub_FinanceReceivablesNet
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the aggregate carrying amount of retail loan and finance lease receivables, net of unearned income and the allowance for losses. These are to be collected after one year from the balance sheet date.

No definition available.

Name:	kub_FinanceReceivablesNoncurrent
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

A valuation allowance for retail loan receivables that are expected to be uncollectible.

No definition available.

Name:	kub_RetailFinanceReceivableAllowanceForCreditLosses
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Reflects the aggregate carrying amount of current and non-current retail loan receivables.

No definition available.

Name:	kub_RetailFinanceReceivableGross
Namespace Prefix:	kub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the aggregate carrying amount of current and non-current retail loan receivables, net of the allowance for credit losses.

No definition available.