Class PRIMECAP Odyssey Stock Fund - C000015069 PRIMECAP Odyssey Stock Fund Class PRIMECAP Odyssey Growth Fund - C000015070 PRIMECAP Odyssey Growth Fund Class PRIMECAP Odyssey Aggressive Growth Fund - C000015071 PRIMECAP Odyssey Aggressive Growth Fund Largest Holding:1ClassTF-Intel Corp. Intel Corp. [Member] Largest Holding:2ClassTF-Eli Lilly & Co. Eli Lilly & Co. [Member] Largest Holding:3ClassTF-AstraZeneca PLC AstraZeneca PLC [Member] Largest Holding:4ClassTF-KLA Corp. KLA Corp. [Member] Largest Holding:5ClassTF-Flex Ltd. Flex Ltd. [Member] Largest Holding:6ClassTF-FedEx Corp. FedEx Corp. [Member] Largest Holding:7ClassTF-Siemens AG Siemens AG [Member] Largest Holding:8ClassTF-Alphabet, Inc. - Class A & C Alphabet, Inc. - Class A & C [Member] Largest Holding:9ClassTF-Ross Stores, Inc. Ross Stores, Inc. [Member] Largest Holding:10ClassTF-Biogen, Inc. Biogen, Inc. [Member] Industry Sector:11ClassTF-Information Technology Information Technology [Member] Industry Sector:12ClassTF-Industrials Industrials [Member] Industry Sector:13ClassTF-Health Care Health Care [Member] Industry Sector:14ClassTF-Financials Financials [Member] Industry Sector:15ClassTF-Consumer Discretionary Consumer Discretionary [Member] Industry Sector:16ClassTF-Communication Services Communication Services [Member] Industry Sector:17ClassTF-Consumer Staples Consumer Staples [Member] Industry Sector:18ClassTF-Energy Energy [Member] Industry Sector:19ClassTF-Materials Materials [Member] Industry Sector:20ClassTF-Utilities Utilities [Member] Industry Sector:21ClassTF-Cash & Other Cash & Other [Member] Largest Holding:22ClassTF-Micron Technology, Inc. Micron Technology, Inc. [Member] Largest Holding:23ClassTF-Intel Corp. Intel Corp. [Member] Largest Holding:24ClassTF-Alphabet, Inc. - Class A & C Alphabet, Inc. - Class A & C [Member] Largest Holding:25ClassTF-Eli Lilly & Co. Eli Lilly & Co. [Member] Largest Holding:26ClassTF-Xometry, Inc. Xometry, Inc. [Member] Largest Holding:27ClassTF-BeOne Medicines Ltd. BeOne Medicines Ltd. [Member] Largest Holding:28ClassTF-Flex Ltd. Flex Ltd. [Member] Largest Holding:29ClassTF-Biogen, Inc. Biogen, Inc. [Member] Largest Holding:30ClassTF-KLA Corp. KLA Corp. [Member] Largest Holding:31ClassTF-NVIDIA Corp. NVIDIA Corp. [Member] Industry Sector:32ClassTF-Information Technology Information Technology [Member] Industry Sector:33ClassTF-Health Care Health Care [Member] Industry Sector:34ClassTF-Industrials Industrials [Member] Industry Sector:35ClassTF-Communication Services Communication Services [Member] Industry Sector:36ClassTF-Financials Financials [Member] Industry Sector:37ClassTF-Consumer Discretionary Consumer Discretionary [Member] Industry Sector:38ClassTF-Consumer Staples Consumer Staples [Member] Industry Sector:39ClassTF-Energy Energy [Member] Industry Sector:40ClassTF-Materials Materials [Member] Industry Sector:41ClassTF-Real Estate Real Estate [Member] Industry Sector:42ClassTF-Cash & Other Cash & Other [Member] Largest Holding:43ClassTF-Micron Technology, Inc. Micron Technology, Inc. [Member] Largest Holding:44ClassTF-Alphabet, Inc. - Class A & C Alphabet, Inc. - Class A & C [Member] Largest Holding:45ClassTF-Flex Ltd. Flex Ltd. [Member] Largest Holding:46ClassTF-Eli Lilly & Co. Eli Lilly & Co. [Member] Largest Holding:47ClassTF-BeOne Medicines Ltd. BeOne Medicines Ltd. [Member] Largest Holding:48ClassTF-Rhythm Pharmaceuticals, Inc. Rhythm Pharmaceuticals, Inc. [Member] Largest Holding:49ClassTF-NVIDIA Corp. NVIDIA Corp. [Member] Largest Holding:50ClassTF-Glaukos Corp. Glaukos Corp. [Member] Largest Holding:51ClassTF-MarketAxess Holdings, Inc. MarketAxess Holdings, Inc. [Member] Largest Holding:52ClassTF-Biogen, Inc. Biogen, Inc. [Member] Industry Sector:53ClassTF-Information Technology Information Technology [Member] Industry Sector:54ClassTF-Health Care Health Care [Member] Industry Sector:55ClassTF-Industrials Industrials [Member] Industry Sector:56ClassTF-Consumer Discretionary Consumer Discretionary [Member] Industry Sector:57ClassTF-Communication Services Communication Services [Member] Industry Sector:58ClassTF-Financials Financials [Member] Industry Sector:59ClassTF-Materials Materials [Member] Industry Sector:60ClassTF-Consumer Staples Consumer Staples [Member] Industry Sector:61ClassTF-Energy Energy [Member] Industry Sector:62ClassTF-Real Estate Real Estate [Member] Industry Sector:63ClassTF-Cash & Other Cash & Other [Member] Net Assets Investment Company Portfolio Turnover Portfolio Turnover Commodity Index Linked Notes [Member] Commodity Index Linked Notes Sovereign Debt Securities [Member] Sovereign Debt Securities Convertible Debt Securities [Member] Convertible Debt Securities Corporate Debt Securities [Member] Corporate Debt Securities Corporate Note Securities [Member] Corporate Note Securities Corporate Bond Securities [Member] Corporate Bond Securities Fixed Income Investments [Member] Fixed Income Investments Securities Investment [Member] Securities Investment Other Aggregated Investments [Member] Other Aggregated Investments Real Estate Sector [Member] Real Estate Sector Standard Poors 500 Index [Member] Standard Poors 500 Index Nasdaq Composite Index [Member] Nasdaq Composite Index Equity Securities Industry [Member] Equity Securities Industry Equity Securities [Member] Equity Securities Dow Jones Industrial Average [Member] Dow Jones Industrial Average Construction Sector [Member] Construction Sector Automotive Sector [Member] Automotive Sector Transportation Sector [Member] Transportation Sector Aerospace Sector [Member] Aerospace Sector Consumer Sector [Member] Consumer Sector Chemicals Sector [Member] Chemicals Sector Insurance Sector [Member] Insurance Sector Cash [Member] Cash Asset Backed Securities [Member] Asset Backed Securities Container And PackagingSector [Member] Container And PackagingSector Investment Type [Axis] Asset Class US Treasury Securities [Member] US Treasury Securities Mortgage Backed Securities [Member] Mortgage Backed Securities Investment Type Categorization [Member] Investment Type Categorization Entertainment Sector [Member] Entertainment Sector Food And Beverage Sector [Member] Food And Beverage Sector Financial Services Sector [Member] Financial Services Sector Healthcare Sector [Member] Healthcare Sector Energy Sector [Member] Energy Sector Technology Sector [Member] Technology Sector Government Sector [Member] Government Sector No Trading Symbol