XML 185 R171.htm IDEA: XBRL DOCUMENT v3.19.1

Shareholders' equity, net (Details Textual)		12 Months Ended
	Jan. 15, 2017	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares S/ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares S/ / shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2018 S/ / shares	Dec. 31, 2009 $ / shares	Jul. 11, 2003 $ / shares
Disclosure of Shareholders' equity, net [Line Items]
Trading frequency		35.00%		25.00%
Par value per share | $ / shares								$ 2.83	$ 0.54
Number of treasure shares purchased | shares						200,000
Payments To Acquire Treasure Shares						$ 1,210,000
Increase in legal reserves		$ 44,000		$ 327,000		30,000
Dividends declared to non controlling interest		$ 5,560,000		$ 6,036,000		$ 7,400,000
Total number of common and investment shares outstanding | shares		253,986,867		253,986,867		253,986,867
Quoted price per equity share | $ / shares		$ 20.80	$ 20.80	$ 29.70	$ 29.70
Dividend Declared		$ 200,000,000
Dividend Declared Per Share | $ / shares		$ 0.571337
Withholding Taxes Percentage		4.10%
Changes in tax rates or tax laws enacted or announced [member]
Disclosure of Shareholders' equity, net [Line Items]
Withholding tax rate, Percent	5.00%
Bottom of range [member]
Disclosure of Shareholders' equity, net [Line Items]
Other capital reserve, Percentage		10.00%
Top of range [member]
Disclosure of Shareholders' equity, net [Line Items]
Other capital reserve, Percentage		20.00%
Additional Paid-in Capital [Member]
Disclosure of Shareholders' equity, net [Line Items]
Treasury shares						$ 605,000
Ordinary shares [member]
Disclosure of Shareholders' equity, net [Line Items]
Market price per share | S/ / shares			$ 53.60		$ 45.00
Par value per share | S/ / shares							S/ 10.00
investment shares [Member]
Disclosure of Shareholders' equity, net [Line Items]
Market price per share | S/ / shares			$ 19.60		$ 22.10
Par value per share | S/ / shares							S/ 10.00

X

- References

No definition available.

+ Details

Name:	cik0001013131_DisclosureOfShareholdersEquityNetLineItems
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents Amount of Dividend Declared.

+ References

No definition available.

+ Details

Name:	cik0001013131_DividendDeclared
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Rate at which Dividend Declared Per Share.

+ References

No definition available.

+ Details

Name:	cik0001013131_DividendDeclaredPerShare
Namespace Prefix:	cik0001013131_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of dividends declared to non-controlling interests.

+ References

No definition available.

+ Details

Name:	cik0001013131_DividendsDeclaredToNonControllingInterest
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of legal reserve increased during the year.

+ References

No definition available.

+ Details

Name:	cik0001013131_IncreaseInLegalReserves
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The market value of each share at the end of the period.

+ References

No definition available.

+ Details

Name:	cik0001013131_MarketPricePerShare
Namespace Prefix:	cik0001013131_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of treasury shares purchased during the year.

+ References

No definition available.

+ Details

Name:	cik0001013131_NumberOfTreasureSharesPurchased
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of other capital reserve from earnings.

+ References

No definition available.

+ Details

Name:	cik0001013131_OtherCapitalReservePercentage
Namespace Prefix:	cik0001013131_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow to acquire treasury shares.

+ References

No definition available.

+ Details

Name:	cik0001013131_PaymentsToAcquireTreasureShares
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The quoted per share value of equity share.

+ References

No definition available.

+ Details

Name:	cik0001013131_QuotedPricePerEquityShare
Namespace Prefix:	cik0001013131_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The total number of common and investment shares outstanding at the end of the period.

+ References

No definition available.

+ Details

Name:	cik0001013131_TotalNumberOfCommonAndInvestmentSharesOutstanding
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of high frequency trading.

+ References

No definition available.

+ Details

Name:	cik0001013131_TradingFrequency
Namespace Prefix:	cik0001013131_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of withholding tax rate.

+ References

No definition available.

+ Details

Name:	cik0001013131_WithholdingTaxRatePercent
Namespace Prefix:	cik0001013131_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Withholding Taxes Percentage by Government.

+ References

No definition available.

+ Details

Name:	cik0001013131_WithholdingTaxesPercentage
Namespace Prefix:	cik0001013131_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iii&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

An entity’s own equity instruments, held by the entity or other members of the consolidated group.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 78
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_e&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 32
-IssueDate 2018-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=32&date=2018-03-01&anchor=para_34&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_TreasuryShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_ChangesInTaxRatesOrTaxLawsEnactedOrAnnouncedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_AdditionalPaidinCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=cik0001013131_InvestmentSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: