Label	Element	Value
PRIMECAP Odyssey Aggressive Growth Fund \| Micron Technology, Inc. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	10.50%
PRIMECAP Odyssey Aggressive Growth Fund \| Alphabet, Inc. - Class A & C [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.60%
PRIMECAP Odyssey Aggressive Growth Fund \| Flex Ltd. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.60%
PRIMECAP Odyssey Aggressive Growth Fund \| Eli Lilly & Co. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.10%
PRIMECAP Odyssey Aggressive Growth Fund \| BeOne Medicines Ltd. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	2.90%
PRIMECAP Odyssey Aggressive Growth Fund \| Rhythm Pharmaceuticals, Inc. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	2.60%
PRIMECAP Odyssey Aggressive Growth Fund \| NVIDIA Corp. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	2.50%
PRIMECAP Odyssey Aggressive Growth Fund \| Glaukos Corp. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	2.30%
PRIMECAP Odyssey Aggressive Growth Fund \| MarketAxess Holdings, Inc. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	2.10%
PRIMECAP Odyssey Aggressive Growth Fund \| Biogen, Inc. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	2.00%
PRIMECAP Odyssey Aggressive Growth Fund \| Information Technology [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	35.60%
PRIMECAP Odyssey Aggressive Growth Fund \| Health Care [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	24.30%
PRIMECAP Odyssey Aggressive Growth Fund \| Industrials [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	13.10%
PRIMECAP Odyssey Aggressive Growth Fund \| Consumer Discretionary [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	11.30%
PRIMECAP Odyssey Aggressive Growth Fund \| Communication Services [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	7.10%
PRIMECAP Odyssey Aggressive Growth Fund \| Financials [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.30%
PRIMECAP Odyssey Aggressive Growth Fund \| Materials [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.80%
PRIMECAP Odyssey Aggressive Growth Fund \| Consumer Staples [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	0.80%
PRIMECAP Odyssey Aggressive Growth Fund \| Energy [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	0.30%
PRIMECAP Odyssey Aggressive Growth Fund \| Real Estate [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	0.10%
PRIMECAP Odyssey Aggressive Growth Fund \| Cash & Other [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.30%

PRIMECAP Odyssey Aggressive Growth Fund | Micron Technology, Inc. [Member]