Debt Instrument, Covenant, Liquidity, Minimum

No definition available.

Name:	bvs_DebtInstrumentCovenantLiquidityMinimum
Namespace Prefix:	bvs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line Of Credit Facility, Number Of Letters Of Credit Outstanding

+ References

No definition available.

+ Details

Name:	bvs_LineOfCreditFacilityNumberOfLettersOfCreditOutstanding
Namespace Prefix:	bvs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

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Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) of the credit facility.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Financial instruments - Narrative (Details)						1 Months Ended		3 Months Ended			4 Months Ended	9 Months Ended
Financial instruments - Narrative (Details)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($) letter_of_credit	Mar. 31, 2023 USD ($)	Jul. 12, 2022	Jul. 11, 2022 USD ($)	Jan. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Sep. 28, 2024 USD ($) letter_of_credit	Sep. 30, 2023 USD ($)	Jul. 01, 2023 USD ($)	Dec. 29, 2021 USD ($)	Sep. 28, 2024 USD ($) letter_of_credit	Sep. 30, 2023 USD ($)	Oct. 29, 2021 USD ($)	Dec. 06, 2019 USD ($)
Debt Instrument [Line Items]
Borrowing on revolver												$ 0	$ 64,000,000
Deferred financing costs		$ 917,000						$ 1,303,000				1,303,000
Original issue discount		$ 1,685,000						$ 1,238,000				$ 1,238,000
Line of credit facility, number of LOCs outstanding \| letter_of_credit		3						3				3
Secured Debt
Debt Instrument [Line Items]
Debt instrument, covenant, liquidity, minimum			$ 10,000,000				$ 10,000,000
Secured Debt \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, lending margin, interest rate			4.25%	3.25%
Secured Debt \| Base Rate
Debt Instrument [Line Items]
Debt instrument, lending margin, interest rate			3.25%	2.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Revolver credit capacity reduced amount	$ 5,000,000	$ 5,000,000
Term Loan \| Level 2
Debt Instrument [Line Items]
Long-term debt, fair value								$ 372,056,000				$ 372,056,000
Line of Credit
Debt Instrument [Line Items]
Loss on debt retirement and modification						$ 0	$ 0
Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount															$ 200,000,000
Line of Credit \| Secured Debt \| Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount														$ 360,750,000
Repayments on revolver											$ 80,000,000
Line of Credit \| Secured Debt \| Term Loan Facility, July 2022
Debt Instrument [Line Items]
Borrowing on revolver					$ 80,000,000
Line of Credit \| Secured Debt \| Term Loan Facilities
Debt Instrument [Line Items]
Deferred financing costs								1,303,000				1,303,000
Long-term debt								368,587,000				368,587,000
Original issue discount								1,238,000				1,238,000
Repayments of medium-term notes										$ 30,000,000
Interest expense, debt								381,000	$ 262,000			1,143,000	1,400,000
Line of Credit \| Secured Debt \| Term Loan Facility, January 2024
Debt Instrument [Line Items]
Debt issuance costs, gross								1,180,000				1,180,000
Amortization of debt issuance costs												325,000
Deferred financing costs								855,000				855,000
Line of Credit \| Secured Debt \| Term Loan Facility, March 2023
Debt Instrument [Line Items]
Debt issuance costs, gross									3,661,000				3,661,000
Amortization of debt issuance costs													1,617,000
Deferred financing costs									$ 2,044,000				$ 2,044,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, borrowing capacity	$ 40,000,000							45,000,000				$ 45,000,000			$ 50,000,000
Debt instrument, term												5 years
Outstanding borrowings on line of credit		$ 15,000,000						15,000,000				$ 15,000,000
Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Revolving credit facility, borrowing capacity								$ 7,500,000				$ 7,500,000
Line of credit facility, number of LOCs outstanding \| letter_of_credit								3				3
Line of credit facility, remaining borrowing capacity								$ 5,300,000				$ 5,300,000
Line of Credit \| Swingline Loan
Debt Instrument [Line Items]
Debt instrument, term												5 days