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Reinsurance - Narrative (Details)			9 Months Ended	72 Months Ended
	Jan. 02, 2016	Jul. 02, 2015	Sep. 30, 2016	Jan. 02, 2016
Minimum [Member]
Reinsurance Retention Policy [Line Items]
Percentage of finance charge for statutory reserves	0.50%	2.00%
Maximum [Member]
Reinsurance Retention Policy [Line Items]
Percentage of finance charge for statutory reserves	2.00%	3.00%
80% Coinsurance Agreement [Member] | Prime Reinsurance Company [Member]
Reinsurance Retention Policy [Line Items]
Percentage of risks and rewards of term life insurance policies in force				80.00%
Novation Agreement [Member] | Pecan Re Inc [Member]
Reinsurance Retention Policy [Line Items]
Percentage of risks and rewards of term life insurance policies in force	80.00%
10% Coinsurance Agreement [Member]
Reinsurance Retention Policy [Line Items]
Percentage of risks and rewards of term life insurance policies in force			10.00%

X

- Definition

Percentage of finance charge for statutory reserves.

+ References

No definition available.

+ Details

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Namespace Prefix:	pri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of risk reinsured on insurance products per entity policy.

+ References

No definition available.

+ Details

Name:	us-gaap_ReinsuranceRetentionPolicyReinsuredRiskPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=pri_EightyPercentageCoinsuranceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CededCreditRiskAxis=pri_PrimeReinsuranceCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=pri_NovationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CededCreditRiskAxis=pri_PecanReIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=pri_TenPercentageCoinsuranceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: