Expense Example	Feb. 28, 2026 USD ($)
PRIMECAP Odyssey Stock Fund Series \| PRIMECAP Odyssey Stock Fund Class
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 68
Expense Example, with Redemption, 3 Years	214
Expense Example, with Redemption, 5 Years	373
Expense Example, with Redemption, 10 Years	835
PRIMECAP Odyssey Growth Fund Series \| PRIMECAP Odyssey Growth Fund Class
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	67
Expense Example, with Redemption, 3 Years	211
Expense Example, with Redemption, 5 Years	368
Expense Example, with Redemption, 10 Years	822
PRIMECAP Odyssey Aggressive Growth Fund Series \| PRIMECAP Odyssey Aggressive Growth Fund Class
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	67
Expense Example, with Redemption, 3 Years	211
Expense Example, with Redemption, 5 Years	368
Expense Example, with Redemption, 10 Years	$ 822

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear01
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear03
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear05
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear10
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a

Name:	dei_LegalEntityAxis=ck0001293967_S000005539Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=ck0001293967_S000005540Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=ck0001293967_S000005541Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: