| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Ultra Series Fund |
| Entity Central Index Key | 0000732697 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Jun. 30, 2024 USD ($) Number | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Ultra Series Fund |
| Entity Central Index Key | 0000732697 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Conservative Allocation Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Conservative Allocation Fund |
| Class Name | Madison Ultra Conservative Allocation Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $17 0.33% |
| Expenses Paid, Amount | $ 17 |
| Expense Ratio, Percent | 0.33% |
| Net Assets | $ 50,612,872 |
| Holdings Count | Number | 17 |
| Advisory Fees Paid, Amount | $ 128,486 |
| Investment Company, Portfolio Turnover | 28% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $50,612,872 # of Portfolio Holdings 17 Portfolio Turnover Rate 28% Total Advisory Fees Paid $128,486 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 35% equity investments and 65% fixed income investments. Top Ten Holdings (% of Net Assets) Madison Core Bond Fund, Class R6 36.3 % Schwab Intermediate-Term U.S. Treasury ETF 12.5 % Madison Investors Fund, Class R6 10.2 % iShares Aaa - A Rated Corporate Bond ETF 7.2 % Janus Henderson Mortgage-Backed Securities ETF 5.7 % Invesco S&P 500 Quality ETF 5.4 % iShares Treasury Floating Rate Bond ETF 3.3 % Schwab U.S. TIPS ETF 3.1 % Vanguard Information Technology ETF 2.9 % Vanguard FTSE Europe ETF 2.2 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 51.8 % Investment Companies 46.4 % Short-Term Investments 6.2 % Other Assets and Liabilities, Net (4.4 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 35% equity investments and 65% fixed income investments. |
| Conservative Allocation Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Conservative Allocation Fund |
| Class Name | Madison Ultra Conservative Allocation Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $29 0.58% |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 50,612,872 |
| Holdings Count | Number | 17 |
| Advisory Fees Paid, Amount | $ 128,486 |
| Investment Company, Portfolio Turnover | 28% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $50,612,872 # of Portfolio Holdings 17 Portfolio Turnover Rate 28% Total Advisory Fees Paid $128,486 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 35% equity investments and 65% fixed income investments. Top Ten Holdings (% of Net Assets) Madison Core Bond Fund, Class R6 36.3 % Schwab Intermediate-Term U.S. Treasury ETF 12.5 % Madison Investors Fund, Class R6 10.2 % iShares Aaa - A Rated Corporate Bond ETF 7.2 % Janus Henderson Mortgage-Backed Securities ETF 5.7 % Invesco S&P 500 Quality ETF 5.4 % iShares Treasury Floating Rate Bond ETF 3.3 % Schwab U.S. TIPS ETF 3.1 % Vanguard Information Technology ETF 2.9 % Vanguard FTSE Europe ETF 2.2 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 51.8 % Investment Companies 46.4 % Short-Term Investments 6.2 % Other Assets and Liabilities, Net (4.4 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 35% equity investments and 65% fixed income investments. |
| Moderate Allocation Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Moderate Allocation Fund |
| Class Name | Madison Ultra Moderate Allocation Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $16 0.32% |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.32% |
| Net Assets | $ 111,384,206 |
| Holdings Count | Number | 18 |
| Advisory Fees Paid, Amount | $ 168,681 |
| Investment Company, Portfolio Turnover | 32% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $111,384,206 # of Portfolio Holdings 18 Portfolio Turnover Rate 32% Total Advisory Fees Paid $168,681 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 60% equity investments and 40% fixed income investments. Top Ten Holdings (% of Net Assets) Madison Core Bond Fund, Class R6 22.1 % Madison Investors Fund, Class R6 16.2 % Invesco S&P 500 Quality ETF 9.0 % Schwab Intermediate-Term U.S. Treasury ETF 8.4 % iShares Treasury Floating Rate Bond ETF 6.1 % Vanguard Information Technology ETF 5.1 % Vanguard FTSE Europe ETF 4.6 % iShares Aaa - A Rated Corporate Bond ETF 4.6 % Franklin FTSE Japan ETF 3.7 % iShares MSCI Emerging Markets Asia ETF 3.6 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 57.8 % Investment Companies 39.8 % Short-Term Investments 2.7 % Other Assets and Liabilities, Net (0.3 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 60% equity investments and 40% fixed income investments. |
| Moderate Allocation Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Moderate Allocation Fund |
| Class Name | Madison Ultra Moderate Allocation Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $29 0.57% |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.57% |
| Net Assets | $ 111,384,206 |
| Holdings Count | Number | 18 |
| Advisory Fees Paid, Amount | $ 168,681 |
| Investment Company, Portfolio Turnover | 32% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $111,384,206 # of Portfolio Holdings 18 Portfolio Turnover Rate 32% Total Advisory Fees Paid $168,681 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 60% equity investments and 40% fixed income investments. Top Ten Holdings (% of Net Assets) Madison Core Bond Fund, Class R6 22.1 % Madison Investors Fund, Class R6 16.2 % Invesco S&P 500 Quality ETF 9.0 % Schwab Intermediate-Term U.S. Treasury ETF 8.4 % iShares Treasury Floating Rate Bond ETF 6.1 % Vanguard Information Technology ETF 5.1 % Vanguard FTSE Europe ETF 4.6 % iShares Aaa - A Rated Corporate Bond ETF 4.6 % Franklin FTSE Japan ETF 3.7 % iShares MSCI Emerging Markets Asia ETF 3.6 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 57.8 % Investment Companies 39.8 % Short-Term Investments 2.7 % Other Assets and Liabilities, Net (0.3 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 60% equity investments and 40% fixed income investments. |
| Aggressive Allocation Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Aggressive Allocation Fund |
| Class Name | Madison Ultra Aggressive Allocation Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $16 0.32% |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.32% |
| Net Assets | $ 41,021,530 |
| Holdings Count | Number | 18 |
| Advisory Fees Paid, Amount | $ 59,801 |
| Investment Company, Portfolio Turnover | 36% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $41,021,530 # of Portfolio Holdings 18 Portfolio Turnover Rate 36% Total Advisory Fees Paid $59,801 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 80% equity investments and 20% fixed income investments. Top Ten Holdings (% of Net Assets) Madison Investors Fund, Class R6 19.2 % Invesco S&P 500 Quality ETF 11.5 % Madison Core Bond Fund, Class R6 11.4 % Vanguard Information Technology ETF 7.1 % Vanguard FTSE Europe ETF 6.7 % iShares Treasury Floating Rate Bond ETF 6.5 % Franklin FTSE Japan ETF 5.0 % iShares MSCI Emerging Markets Asia ETF 4.8 % Schwab Intermediate-Term U.S. Treasury ETF 4.5 % Energy Select Sector SPDR Fund ETF 4.3 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 62.4 % Investment Companies 32.5 % Short-Term Investments 5.6 % Other Assets and Liabilities, Net (0.5 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 80% equity investments and 20% fixed income investments. |
| Aggressive Allocation Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Aggressive Allocation Fund |
| Class Name | Madison Ultra Aggressive Allocation Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $29 0.57% |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.57% |
| Net Assets | $ 41,021,530 |
| Holdings Count | Number | 18 |
| Advisory Fees Paid, Amount | $ 59,801 |
| Investment Company, Portfolio Turnover | 36% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $41,021,530 # of Portfolio Holdings 18 Portfolio Turnover Rate 36% Total Advisory Fees Paid $59,801 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 80% equity investments and 20% fixed income investments. Top Ten Holdings (% of Net Assets) Madison Investors Fund, Class R6 19.2 % Invesco S&P 500 Quality ETF 11.5 % Madison Core Bond Fund, Class R6 11.4 % Vanguard Information Technology ETF 7.1 % Vanguard FTSE Europe ETF 6.7 % iShares Treasury Floating Rate Bond ETF 6.5 % Franklin FTSE Japan ETF 5.0 % iShares MSCI Emerging Markets Asia ETF 4.8 % Schwab Intermediate-Term U.S. Treasury ETF 4.5 % Energy Select Sector SPDR Fund ETF 4.3 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 62.4 % Investment Companies 32.5 % Short-Term Investments 5.6 % Other Assets and Liabilities, Net (0.5 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in shares of other registered investment companies. The Fund's total net assets will be allocated among various asset classes and underlying funds with target allocations over time of approximately 80% equity investments and 20% fixed income investments. |
| Diversified Income Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Income Fund |
| Class Name | Madison Ultra Diversified Income Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $14 0.27% |
| Expenses Paid, Amount | $ 14 |
| Expense Ratio, Percent | 0.27% |
| Net Assets | $ 155,804,865 |
| Holdings Count | Number | 19 |
| Advisory Fees Paid, Amount | $ 205,125 |
| Investment Company, Portfolio Turnover | 2% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $155,804,865 # of Portfolio Holdings 19 Portfolio Turnover Rate 2% Total Advisory Fees Paid $205,125 |
| Holdings [Text Block] | What does the Fund invest in? The Fund primarily invests in shares of other registered investment companies, diversifying across various asset classes according to an asset allocation approximately 60% in equity investments and 40% in fixed income investments. Top Ten Holdings (% of Net Assets) Madison Covered Call ETF 23.9 % Madison Short-Term Strategic Income ETF 19.0 % Madison Aggregate Bond ETF 17.2 % Madison Dividend Value ETF 17.0 % Janus Henderson Mortgage-Backed Securities ETF 9.2 % iShares Aaa - A Rated Corporate Bond ETF 6.5 % Global X MLP ETF 2.8 % Vanguard Dividend Appreciation ETF 2.5 % Government National Mortgage Association , 6.500%, due 04/20/31 0.0 % Federal National Mortgage Association, 7.000%, due 11/01/31 0.0 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 98.1 % Short-Term Investments 2.0 % Mortgage Backed Securities 0.0 %* Asset Backed Securities 0.0 %* Collateralized Mortgage Obligations 0.0 %* Other Assets and Liabilities, Net (0.1 %) |
| Exposure Basis Explanation [Text Block] | The Fund primarily invests in shares of other registered investment companies, diversifying across various asset classes according to an asset allocation approximately 60% in equity investments and 40% in fixed income investments. |
| Diversified Income Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Income Fund |
| Class Name | Madison Ultra Diversified Income Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $26 0.52% |
| Expenses Paid, Amount | $ 26 |
| Expense Ratio, Percent | 0.52% |
| Net Assets | $ 155,804,865 |
| Holdings Count | Number | 19 |
| Advisory Fees Paid, Amount | $ 205,125 |
| Investment Company, Portfolio Turnover | 2% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $155,804,865 # of Portfolio Holdings 19 Portfolio Turnover Rate 2% Total Advisory Fees Paid $205,125 |
| Holdings [Text Block] | What does the Fund invest in? T he Fund primarily invests in shares of other registered investment companies, diversifying across various asset classes according to an asset allocation approximately 60% in equity investments and 40% in fixed income investments Top Ten Holdings (% of Net Assets) Madison Covered Call ETF 23.9 % Madison Short-Term Strategic Income ETF 19.0 % Madison Aggregate Bond ETF 17.2 % Madison Dividend Value ETF 17.0 % Janus Henderson Mortgage-Backed Securities ETF 9.2 % iShares Aaa - A Rated Corporate Bond ETF 6.5 % Global X MLP ETF 2.8 % Vanguard Dividend Appreciation ETF 2.5 % Government National Mortgage Association , 6.500%, due 04/20/31 0.0 % Federal National Mortgage Association, 7.000%, due 11/01/31 0.0 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 98.1 % Short-Term Investments 2.0 % Mortgage Backed Securities 0.0 %* Asset Backed Securities 0.0 %* Collateralized Mortgage Obligations 0.0 %* Other Assets and Liabilities, Net (0.1 %) |
| Exposure Basis Explanation [Text Block] | he Fund primarily invests in shares of other registered investment companies, diversifying across various asset classes according to an asset allocation approximately 60% in equity investments and 40% in fixed income investments |
| Core Bond Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Ultra Bond Fund |
| Class Name | Madison Ultra Bond Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www. ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www. ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $28 0.57% |
| Expenses Paid, Amount | $ 28 |
| Expense Ratio, Percent | 0.57% |
| Net Assets | $ 67,461,415 |
| Holdings Count | Number | 279 |
| Advisory Fees Paid, Amount | $ 193,544 |
| Investment Company, Portfolio Turnover | 10% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $67,461,415 # of Portfolio Holdings 279 Portfolio Turnover Rate 10% Total Advisory Fees Paid $193,544 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primary in fixed income securities such as Corporate, U.S. Government and Foreign debt securities. In addition the fund also invested in asset backed, mortgage-backed and commercial mortgage-backed securities. Top Ten Holdings (% of Net Assets) U.S. Treasury Notes , 2.625%, due 02/15/29 3.4 % U.S. Treasury Bonds , 6.625%, due 02/15/27 3.1 % U.S. Treasury Bonds , 4.500%, due 05/15/38 3.0 % U.S. Treasury Notes , 2.875%, due 05/15/28 2.8 % Federal Home Loan Mortgage Corp. , 3.000%, due 04/01/43 1.8 % Federal National Mortgage Association , 4.500%, due 08/01/52 1.6 % Federal National Mortgage Association , 4.000%, due 05/01/52 1.5 % U.S. Treasury Bonds , 3.750%, due 08/15/41 1.3 % Federal Home Loan Mortgage Corp. , 2.500%, due 01/01/52 1.3 % Hillsboro School District No 1J, General Obligation, 4.35%, 6/30/34, 4.355%, due 06/30/34 1.2 % Portfolio Allocation (% of Net Assets) Mortgage Backed Securities 34.4 % Corporate Notes and Bonds 29.9 % U.S. Government and Agency Obligations 20.3 % Foreign Corporate Bonds 4.0 % Collateralized Mortgage Obligations 3.6 % Asset Backed Securities 3.4 % Short-Term Investments 2.6 % Commercial Mortgage-Backed Securities 1.2 % Long Term Municipal Bonds 1.2 % Other Assets and Liabilities, Net (0.6 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primary in fixed income securities such as Corporate, U.S. Government and Foreign debt securities. In addition the fund also invested in asset backed, mortgage-backed and commercial mortgage-backed securities. |
| Core Bond Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Ultra Bond Fund |
| Class Name | Madison Ultra Bond Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www. ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www. ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $41 0.82% |
| Expenses Paid, Amount | $ 41 |
| Expense Ratio, Percent | 0.82% |
| Net Assets | $ 67,461,415 |
| Holdings Count | Number | 279 |
| Advisory Fees Paid, Amount | $ 193,544 |
| Investment Company, Portfolio Turnover | 10% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $67,461,415 # of Portfolio Holdings 279 Portfolio Turnover Rate 10% Total Advisory Fees Paid $193,544 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primary in fixed income securities such as Corporate, U.S. Government and Foreign debt securities. In addition the fund also invested in asset backed, mortgage-backed and commercial mortgage-backed securities. Top Ten Holdings (% of Net Assets) U.S. Treasury Notes , 2.625%, due 02/15/29 3.4 % U.S. Treasury Bonds , 6.625%, due 02/15/27 3.1 % U.S. Treasury Bonds , 4.500%, due 05/15/38 3.0 % U.S. Treasury Notes , 2.875%, due 05/15/28 2.8 % Federal Home Loan Mortgage Corp. , 3.000%, due 04/01/43 1.8 % Federal National Mortgage Association , 4.500%, due 08/01/52 1.6 % Federal National Mortgage Association , 4.000%, due 05/01/52 1.5 % U.S. Treasury Bonds , 3.750%, due 08/15/41 1.3 % Federal Home Loan Mortgage Corp. , 2.500%, due 01/01/52 1.3 % Hillsboro School District No 1J, General Obligation, 4.35%, 6/30/34, 4.355%, due 06/30/34 1.2 % Portfolio Allocation (% of Net Assets) Mortgage Backed Securities 34.4 % Corporate Notes and Bonds 29.9 % U.S. Government and Agency Obligations 20.3 % Foreign Corporate Bonds 4.0 % Collateralized Mortgage Obligations 3.6 % Asset Backed Securities 3.4 % Short-Term Investments 2.6 % Commercial Mortgage-Backed Securities 1.2 % Long Term Municipal Bonds 1.2 % Other Assets and Liabilities, Net (0.6 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primary in fixed income securities such as Corporate, U.S. Government and Foreign debt securities. In addition the fund also invested in asset backed, mortgage-backed and commercial mortgage-backed securities. |
| High Income Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | Madison Ultra High Income Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $39 0.77% |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.77% |
| Net Assets | $ 11,032,582 |
| Holdings Count | Number | 62 |
| Advisory Fees Paid, Amount | $ 41,990 |
| Investment Company, Portfolio Turnover | 5% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $11,032,582 # of Portfolio Holdings 62 Portfolio Turnover Rate 5% Total Advisory Fees Paid $41,990 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in lower-rated, higher-yielding income bearing securities. The Fund targets to invest at least 80% of its net assets in bonds rated lower than investment grade (BBB/Baa) and their unrated equivalents or other high-yielding securities. Top Ten Holdings (% of Net Assets) iShares iBoxx High Yield Corporate Bond ETF 4.1 % Murphy Oil USA, Inc. , 5.625%, due 05/01/27 3.6 % HCA, Inc., 5.875%, due 02/15/26 2.3 % United Rentals North America, Inc. , 5.500%, due 05/15/27 2.3 % International Game Technology PLC , 4.125%, due 04/15/26 2.2 % SBA Communications Corp. , 3.875%, due 02/15/27 2.1 % Sunoco LP/Sunoco Finance Corp. , 6.000%, due 04/15/27 2.1 % Waste Pro USA, Inc. , 5.500%, due 02/15/26 2.0 % Performance Food Group, Inc. , 5.500%, due 10/15/27 2.0 % Frontier Communications Holdings LLC , 5.000%, due 05/01/28 1.9 % Portfolio Allocation (% of Net Assets) Corporate Notes and Bonds 80.4 % Short-Term Investments 27.9 % Foreign Corporate Bonds 6.0 % Exchange Traded Funds 4.1 % Other Assets and Liabilities, Net (18.4 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in lower-rated, higher-yielding income bearing securities. The Fund targets to invest at least 80% of its net assets in bonds rated lower than investment grade (BBB/Baa) and their unrated equivalents or other high-yielding securities. |
| High Income Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | Madison Ultra High Income Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www. ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www. ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class II $51 1.02% |
| Expenses Paid, Amount | $ 51 |
| Expense Ratio, Percent | 1.02% |
| Net Assets | $ 11,032,582 |
| Holdings Count | Number | 62 |
| Advisory Fees Paid, Amount | $ 41,990 |
| Investment Company, Portfolio Turnover | 5% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $11,032,582 # of Portfolio Holdings 62 Portfolio Turnover Rate 5% Total Advisory Fees Paid $41,990 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in lower-rated, higher-yielding income bearing securities. The Fund targets to invest at least 80% of its net assets in bonds rated lower than investment grade (BBB/Baa) and their unrated equivalents or other high-yielding securities. Top Ten Holdings (% of Net Assets) iShares iBoxx High Yield Corporate Bond ETF 4.1 % Murphy Oil USA, Inc. , 5.625%, due 05/01/27 3.6 % HCA, Inc., 5.875%, due 02/15/26 2.3 % United Rentals North America, Inc. , 5.500%, due 05/15/27 2.3 % International Game Technology PLC , 4.125%, due 04/15/26 2.2 % SBA Communications Corp. , 3.875%, due 02/15/27 2.1 % Sunoco LP/Sunoco Finance Corp. , 6.000%, due 04/15/27 2.1 % Waste Pro USA, Inc. , 5.500%, due 02/15/26 2.0 % Performance Food Group, Inc. , 5.500%, due 10/15/27 2.0 % Frontier Communications Holdings LLC , 5.000%, due 05/01/28 1.9 % Portfolio Allocation (% of Net Assets) Corporate Notes and Bonds 80.4 % Short-Term Investments 27.9 % Foreign Corporate Bonds 6.0 % Exchange Traded Funds 4.1 % Other Assets and Liabilities, Net (18.4 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in lower-rated, higher-yielding income bearing securities. The Fund targets to invest at least 80% of its net assets in bonds rated lower than investment grade (BBB/Baa) and their unrated equivalents or other high-yielding securities. |
| Large Cap Value Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Large Cap Value Fund |
| Class Name | Madison Ultra Large Cap Value Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $31 0.62% |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.62% |
| Net Assets | $ 174,778,835 |
| Holdings Count | Number | 38 |
| Advisory Fees Paid, Amount | $ 543,273 |
| Investment Company, Portfolio Turnover | 17% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $174,778,835 # of Portfolio Holdings 38 Portfolio Turnover Rate 17% Total Advisory Fees Paid $543,273 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000 ® Top Ten Holdings (% of Net Assets) NextEra Energy, Inc. 4.1 % Morgan Stanley 3.9 % Automatic Data Processing, Inc. 3.9 % Texas Instruments, Inc. 3.8 % Honeywell International, Inc. 3.8 % Fastenal Co. 3.7 % Home Depot, Inc. 3.7 % Medtronic PLC 3.6 % EOG Resources, Inc. 3.6 % Comcast Corp., Class A 3.4 % Sector Allocation (% of Net Assets) Financials 20.2 % Industrials 19.0 % Health Care 11.5 % Energy 11.2 % Consumer Discretionary 9.1 % Consumer Staples 8.6 % Information Technology 6.5 % Utilities 4.1 % Communication Services 3.4 % Equity Real Estate Investment Trusts (REITs) 2.8 % Materials 2.1 % Short-Term Investments 1.5 % Other Assets and Liabilities, Net 0.1 % |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000 ® |
| Large Cap Value Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Large Cap Value Fund |
| Class Name | Madison Ultra Large Cap Value Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $43 0.87% |
| Expenses Paid, Amount | $ 43 |
| Expense Ratio, Percent | 0.87% |
| Net Assets | $ 174,778,835 |
| Holdings Count | Number | 38 |
| Advisory Fees Paid, Amount | $ 543,273 |
| Investment Company, Portfolio Turnover | 17% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $174,778,835 # of Portfolio Holdings 38 Portfolio Turnover Rate 17% Total Advisory Fees Paid $543,273 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000® Value Index. The Fund targets to maintain at least 80% of its net assets in such stocks. Top Ten Holdings (% of Net Assets) NextEra Energy, Inc. 4.1 % Morgan Stanley 3.9 % Automatic Data Processing, Inc. 3.9 % Texas Instruments, Inc. 3.8 % Honeywell International, Inc. 3.8 % Fastenal Co. 3.7 % Home Depot, Inc. 3.7 % Medtronic PLC 3.6 % EOG Resources, Inc. 3.6 % Comcast Corp., Class A 3.4 % Sector Allocation (% of Net Assets) Financials 20.2 % Industrials 19.0 % Health Care 11.5 % Energy 11.2 % Consumer Discretionary 9.1 % Consumer Staples 8.6 % Information Technology 6.5 % Utilities 4.1 % Communication Services 3.4 % Equity Real Estate Investment Trusts (REITs) 2.8 % Materials 2.1 % Short-Term Investments 1.5 % Other Assets and Liabilities, Net 0.1 % |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000® Value Index. The Fund targets to maintain at least 80% of its net assets in such stocks. |
| Large Cap Growth Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Large Cap Growth Fund |
| Class Name | Madison Ultra Large Cap Growth Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $43 0.82% |
| Expenses Paid, Amount | $ 43 |
| Expense Ratio, Percent | 0.82% |
| Net Assets | $ 199,916,108 |
| Holdings Count | Number | 31 |
| Advisory Fees Paid, Amount | $ 810,427 |
| Investment Company, Portfolio Turnover | 4% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $199,916,108 # of Portfolio Holdings 31 Portfolio Turnover Rate 4% Total Advisory Fees Paid $810,427 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000® Growth Index. The Fund targets to maintain at least 80% of its net assets in such stocks. Top Ten Holdings (% of Net Assets) Alphabet, Inc., Class C 10.0 % Arch Capital Group Ltd. 6.7 % Amazon.com, Inc. 5.1 % Fiserv, Inc. 4.6 % PACCAR, Inc. 4.6 % Analog Devices, Inc. 4.3 % TJX Cos., Inc. 4.1 % Berkshire Hathaway, Inc., Class B 4.0 % Alcon, Inc. 3.9 % Parker-Hannifin Corp. 3.9 % Sector Allocation (% of Net Assets) Financials 32.3 % Industrials 16.1 % Consumer Discretionary 15.2 % Communication Services 11.1 % Health Care 10.8 % Information Technology 10.6 % Consumer Staples 2.5 % Short-Term Investments 1.4 % Other Assets and Liabilities, Net 0.0 % |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000® Growth Index. The Fund targets to maintain at least 80% of its net assets in such stocks. |
| Large Cap Growth Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Large Cap Growth Fund |
| Class Name | Madison Ultra Large Cap Growth Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $55 1.07% |
| Expenses Paid, Amount | $ 55 |
| Expense Ratio, Percent | 1.07% |
| Net Assets | $ 199,916,108 |
| Holdings Count | Number | 31 |
| Advisory Fees Paid, Amount | $ 810,427 |
| Investment Company, Portfolio Turnover | 4% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $199,916,108 # of Portfolio Holdings 31 Portfolio Turnover Rate 4% Total Advisory Fees Paid $810,427 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000® Growth Index. The Fund targets to maintain at least 80% of its net assets in such stocks. Top Ten Holdings (% of Net Assets) Alphabet, Inc., Class C 10.0 % Arch Capital Group Ltd. 6.7 % Amazon.com, Inc. 5.1 % Fiserv, Inc. 4.6 % PACCAR, Inc. 4.6 % Analog Devices, Inc. 4.3 % TJX Cos., Inc. 4.1 % Berkshire Hathaway, Inc., Class B 4.0 % Alcon, Inc. 3.9 % Parker-Hannifin Corp. 3.9 % Sector Allocation (% of Net Assets) Financials 32.3 % Industrials 16.1 % Consumer Discretionary 15.2 % Communication Services 11.1 % Health Care 10.8 % Information Technology 10.6 % Consumer Staples 2.5 % Short-Term Investments 1.4 % Other Assets and Liabilities, Net 0.0 % |
| Exposure Basis Explanation [Text Block] | The Fund invests primarily in common stocks of large-cap companies as defined as those in the Russell 1000® Growth Index. The Fund targets to maintain at least 80% of its net assets in such stocks. |
| Mid Cap Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Mid Cap Fund |
| Class Name | Madison Ultra Mid Cap Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www. ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www. ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $47 0.92% |
| Expenses Paid, Amount | $ 47 |
| Expense Ratio, Percent | 0.92% |
| Net Assets | $ 147,057,759 |
| Holdings Count | Number | 30 |
| Advisory Fees Paid, Amount | $ 688,236 |
| Investment Company, Portfolio Turnover | 6% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $147,057,759 # of Portfolio Holdings 30 Portfolio Turnover Rate 6% Total Advisory Fees Paid $688,236 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests in common stocks, securities convertible into common stocks and related equity securities of midsize companies defined as those companies with market capitalizations of between $500 million and $70 billion. Top Ten Holdings (% of Net Assets) Arch Capital Group Ltd. 8.9 % Gartner, Inc. 6.5 % Ross Stores, Inc. 6.1 % Brown & Brown, Inc. 5.0 % Copart, Inc. 4.6 % PACCAR, Inc. 4.4 % Carlisle Cos., Inc. 4.4 % Amphenol Corp., Class A 4.3 % Dollar Tree, Inc. 3.6 % CDW Corp. 3.4 % Sector Allocation (% of Net Assets) Information Technology 23.8 % Financials 23.6 % Industrials 16.9 % Consumer Discretionary 14.8 % Consumer Staples 5.8 % Short-Term Investments 5.8 % Health Care 5.3 % Communication Services 4.5 % Other Assets and Liabilities, Net (0.5 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests in common stocks, securities convertible into common stocks and related equity securities of midsize companies defined as those companies with market capitalizations of between $500 million and $70 billion. |
| Mid Cap Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | Mid Cap Fund |
| Class Name | Madison Ultra Mid Cap Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www. ultraseriesfund.com 1-800-877-608 |
| Additional Information Phone Number | 1-800-877-608 |
| Additional Information Website | www. ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $60 1.17% |
| Expenses Paid, Amount | $ 60 |
| Expense Ratio, Percent | 1.17% |
| Net Assets | $ 147,057,759 |
| Holdings Count | Number | 30 |
| Advisory Fees Paid, Amount | $ 688,236 |
| Investment Company, Portfolio Turnover | 6% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $147,057,759 # of Portfolio Holdings 30 Portfolio Turnover Rate 6% Total Advisory Fees Paid $688,236 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests in common stocks, securities convertible into common stocks and related equity securities of midsize companies defined as those companies with market capitalizations of between $500 million and $70 billion. Top Ten Holdings (% of Net Assets) Arch Capital Group Ltd. 8.9 % Gartner, Inc. 6.5 % Ross Stores, Inc. 6.1 % Brown & Brown, Inc. 5.0 % Copart, Inc. 4.6 % PACCAR, Inc. 4.4 % Carlisle Cos., Inc. 4.4 % Amphenol Corp., Class A 4.3 % Dollar Tree, Inc. 3.6 % CDW Corp. 3.4 % Sector Allocation (% of Net Assets) Information Technology 23.8 % Financials 23.6 % Industrials 16.9 % Consumer Discretionary 14.8 % Consumer Staples 5.8 % Short-Term Investments 5.8 % Health Care 5.3 % Communication Services 4.5 % Other Assets and Liabilities, Net (0.5 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests in common stocks, securities convertible into common stocks and related equity securities of midsize companies defined as those companies with market capitalizations of between $500 million and $70 billion. |
| International Stock Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | International Stock Fund |
| Class Name | Madison Ultra International Stock Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $59 1.17% |
| Expenses Paid, Amount | $ 59 |
| Expense Ratio, Percent | 1.17% |
| Net Assets | $ 19,043,286 |
| Holdings Count | Number | 58 |
| Advisory Fees Paid, Amount | $ 112,477 |
| Investment Company, Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $19,043,286 # of Portfolio Holdings 58 Portfolio Turnover Rate 11% Total Advisory Fees Paid $112,477 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests in stocks of foreign companies, defined as those with principal operations, organization, or trading outside the U.S., or whose securities are in foreign currencies. This includes common stocks, convertible securities, preferred stocks, and equity interests such as ADRs, EDRs, GDRs, and SDRs. Top Ten Holdings (% of Net Assets) Japan 17.0 % Germany 11.6 % United Kingdom 9.9 % France 8.0 % India 7.7 % Switzerland 6.5 % China 6.4 % Mexico 5.7 % Canada 5.0 % Netherlands 4.9 % Hong Kong 2.1 % Taiwan 2.1 % United States 2.0 % Ireland 2.0 % Sector Allocation (% of Net Assets) Information Technology 17.3 % Financials 15.8 % Industrials 11.8 % Consumer Discretionary 11.5 % Materials 11.0 % Consumer Staples 10.7 % Health Care 8.1 % Communication Services 6.7 % Energy 4.3 % Short-Term Investments 3.6 % Other Assets and Liabilities, Net (0.8 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests in stocks of foreign companies, defined as those with principal operations, organization, or trading outside the U.S., or whose securities are in foreign currencies. This includes common stocks, convertible securities, preferred stocks, and equity interests such as ADRs, EDRs, GDRs, and SDRs. |
| International Stock Fund Class II | |
| Shareholder Report [Line Items] | |
| Fund Name | International Stock Fund |
| Class Name | Madison Ultra International Stock Fund Class II |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class II $71 1.42% |
| Expenses Paid, Amount | $ 71 |
| Expense Ratio, Percent | 1.42% |
| Net Assets | $ 19,043,286 |
| Holdings Count | Number | 58 |
| Advisory Fees Paid, Amount | $ 112,477 |
| Investment Company, Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $19,043,286 # of Portfolio Holdings 58 Portfolio Turnover Rate 11% Total Advisory Fees Paid $112,477 |
| Holdings [Text Block] | What does the Fund invest in? The Fund invests in stocks of foreign companies, defined as those with principal operations, organization, or trading outside the U.S., or whose securities are in foreign currencies. This includes common stocks, convertible securities, preferred stocks, and equity interests such as ADRs, EDRs, GDRs, and SDRs. Top Ten Holdings (% of Net Assets) Japan 17.0 % Germany 11.6 % United Kingdom 9.9 % France 8.0 % India 7.7 % Switzerland 6.5 % China 6.4 % Mexico 5.7 % Canada 5.0 % Netherlands 4.9 % Hong Kong 2.1 % Taiwan 2.1 % United States 2.0 % Ireland 2.0 % Sector Allocation (% of Net Assets) Information Technology 17.3 % Financials 15.8 % Industrials 11.8 % Consumer Discretionary 11.5 % Materials 11.0 % Consumer Staples 10.7 % Health Care 8.1 % Communication Services 6.7 % Energy 4.3 % Short-Term Investments 3.6 % Other Assets and Liabilities, Net (0.8 %) |
| Exposure Basis Explanation [Text Block] | The Fund invests in stocks of foreign companies, defined as those with principal operations, organization, or trading outside the U.S., or whose securities are in foreign currencies. This includes common stocks, convertible securities, preferred stocks, and equity interests such as ADRs, EDRs, GDRs, and SDRs. |
| Madison Target Retirement 2020 Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Madison Target Retirement 2020 Fund |
| Class Name | Madison Target Retirement 2020 Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $16 0.31% |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.31% |
| Net Assets | $ 14,170,196 |
| Holdings Count | Number | 19 |
| Advisory Fees Paid, Amount | $ 18,641 |
| Investment Company, Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $14,170,196 # of Portfolio Holdings 19 Portfolio Turnover Rate 20% Total Advisory Fees Paid $18,641 |
| Holdings [Text Block] | What does the Fund invest in? The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2020. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. Top Ten Holdings (% of Net Assets) SPDR Portfolio Short Term Treasury ETF 22.6 % Janus Henderson Mortgage-Backed Securities ETF 19.6 % iShares 7-10 Year Treasury Bond ETF 11.8 % Schwab Intermediate-Term U.S. Treasury ETF 8.6 % iShares MBS ETF 6.3 % Invesco S&P 500 Quality ETF 5.7 % iShares Aaa - A Rated Corporate Bond ETF 5.4 % Distillate U.S. Fundamental Stability & Value ETF 4.4 % Vanguard Extended Duration Treasury ETF 3.9 % iShares MSCI International Quality Factor ETF, Class USD INC 2.7 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 97.6 % Short-Term Investments 2.3 % Other Assets and Liabilities, Net 0.1 % |
| Exposure Basis Explanation [Text Block] | The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2020. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. |
| Madison Target Retirement 2030 Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Madison Target Retirement 2030 Fund |
| Class Name | Madison Target Retirement 2030 Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $16 0.31% |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.31% |
| Net Assets | $ 54,319,777 |
| Holdings Count | Number | 20 |
| Advisory Fees Paid, Amount | $ 68,458 |
| Investment Company, Portfolio Turnover | 22% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $54,319,777 # of Portfolio Holdings 20 Portfolio Turnover Rate 22% Total Advisory Fees Paid $68,458 |
| Holdings [Text Block] | What does the Fund invest in? The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2030. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. Top Ten Holdings (% of Net Assets) SPDR Portfolio Short Term Treasury ETF 15.2 % Janus Henderson Mortgage-Backed Securities ETF 14.3 % Invesco S&P 500 Quality ETF 9.6 % iShares 7-10 Year Treasury Bond ETF 8.8 % Schwab Intermediate-Term U.S. Treasury ETF 8.8 % Distillate U.S. Fundamental Stability & Value ETF 8.0 % iShares MBS ETF 5.0 % Vanguard Information Technology ETF 4.9 % iShares MSCI International Quality Factor ETF, Class USD INC 3.8 % iShares Aaa - A Rated Corporate Bond ETF 3.6 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 98.4 % Short-Term Investments 1.6 % Other Assets and Liabilities, Net 0.0 % |
| Exposure Basis Explanation [Text Block] | The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2030. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. |
| Madison Target Retirement 2040 Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Madison Target Retirement 2040 Fund |
| Class Name | Madison Target Retirement 2040 Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $15 0.30% |
| Expenses Paid, Amount | $ 15 |
| Expense Ratio, Percent | 0.30% |
| Net Assets | $ 39,507,616 |
| Holdings Count | Number | 20 |
| Advisory Fees Paid, Amount | $ 48,721 |
| Investment Company, Portfolio Turnover | 24% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $39,507,616 # of Portfolio Holdings 20 Portfolio Turnover Rate 24% Total Advisory Fees Paid $48,721 |
| Holdings [Text Block] | What does the Fund invest in? The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2040. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. Top Ten Holdings (% of Net Assets) Invesco S&P 500 Quality ETF 13.9 % Distillate U.S. Fundamental Stability & Value ETF 12.9 % iShares 7-10 Year Treasury Bond ETF 8.3 % Janus Henderson Mortgage-Backed Securities ETF 8.1 % Schwab Intermediate-Term U.S. Treasury ETF 8.0 % Vanguard Information Technology ETF 7.3 % SPDR Portfolio Short Term Treasury ETF 6.0 % iShares MSCI International Quality Factor ETF, Class USD INC 5.1 % iShares MSCI Emerging Markets Asia ETF 4.0 % iShares MBS ETF 3.9 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 97.8 % Short-Term Investments 2.2 % Other Assets and Liabilities, Net 0.0 % |
| Exposure Basis Explanation [Text Block] | The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2040. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. |
| Madison Target Retirement 2050 Fund Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Madison Target Retirement 2050 Fund |
| Class Name | Madison Target Retirement 2050 Fund Class I |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ultraseriesfund.com 1-800-877-6089 |
| Additional Information Phone Number | 1-800-877-6089 |
| Additional Information Website | www.ultraseriesfund.com |
| Expenses [Text Block] | What were the Fund costs for last period? (based on a hypothetical $10,000 investment) Cost of a $10,000 Costs paid as a Class I $15 0.30% |
| Expenses Paid, Amount | $ 15 |
| Expense Ratio, Percent | 0.30% |
| Net Assets | $ 34,627,500 |
| Holdings Count | Number | 20 |
| Advisory Fees Paid, Amount | $ 41,792 |
| Investment Company, Portfolio Turnover | 23% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $34,627,500 # of Portfolio Holdings 20 Portfolio Turnover Rate 23% Total Advisory Fees Paid $41,792 |
| Holdings [Text Block] | What does the Fund invest in? The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2050. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. Top Ten Holdings (% of Net Assets) Invesco S&P 500 Quality ETF 16.8 % Distillate U.S. Fundamental Stability & Value ETF 14.2 % Vanguard Information Technology ETF 8.5 % Schwab Intermediate-Term U.S. Treasury ETF 7.0 % iShares 7-10 Year Treasury Bond ETF 6.9 % Janus Henderson Mortgage-Backed Securities ETF 6.3 % iShares MSCI International Quality Factor ETF, Class USD INC 5.8 % iShares MSCI Emerging Markets Asia ETF 4.6 % JPMorgan BetaBuilders Japan ETF 3.7 % SPDR Portfolio Short Term Treasury ETF 3.3 % Portfolio Allocation (% of Net Assets) Exchange Traded Funds 96.7 % Short-Term Investments 3.2 % Other Assets and Liabilities, Net 0.1 % |
| Exposure Basis Explanation [Text Block] | The Fund primarily invests in shares of other registered investment companies, following an asset allocation strategy for those planning to retire around 2050. As time progresses, the Fund's allocation will shift to a more conservative mix, aiming for about 10-30% in stock funds and 70-90% in bond funds. |
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| Conservative Allocation Fund Class I | Madison Core Bond Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.30% |
| Conservative Allocation Fund Class I | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| Conservative Allocation Fund Class I | Madison Investors Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Conservative Allocation Fund Class I | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| Conservative Allocation Fund Class I | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Conservative Allocation Fund Class I | Invesco S And P 500 Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Conservative Allocation Fund Class I | I Shares Treasury Floating Rate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Conservative Allocation Fund Class I | Schwab US TIPS ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Conservative Allocation Fund Class I | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Conservative Allocation Fund Class I | Vanguard FTSE Europe ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Conservative Allocation Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51.80% |
| Conservative Allocation Fund Class I | Investment Companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.40% |
| Conservative Allocation Fund Class I | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Conservative Allocation Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (4.40%) |
| Conservative Allocation Fund Class II | Madison Core Bond Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.30% |
| Conservative Allocation Fund Class II | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| Conservative Allocation Fund Class II | Madison Investors Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Conservative Allocation Fund Class II | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| Conservative Allocation Fund Class II | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Conservative Allocation Fund Class II | Invesco S And P 500 Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Conservative Allocation Fund Class II | I Shares Treasury Floating Rate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Conservative Allocation Fund Class II | Schwab US TIPS ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Conservative Allocation Fund Class II | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Conservative Allocation Fund Class II | Vanguard FTSE Europe ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Conservative Allocation Fund Class II | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51.80% |
| Conservative Allocation Fund Class II | Investment Companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.40% |
| Conservative Allocation Fund Class II | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Conservative Allocation Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (4.40%) |
| Moderate Allocation Fund Class I | Madison Core Bond Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.10% |
| Moderate Allocation Fund Class I | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Moderate Allocation Fund Class I | Madison Investors Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Moderate Allocation Fund Class I | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Moderate Allocation Fund Class I | Invesco S And P 500 Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Moderate Allocation Fund Class I | I Shares Treasury Floating Rate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Moderate Allocation Fund Class I | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Moderate Allocation Fund Class I | Vanguard FTSE Europe ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Moderate Allocation Fund Class I | Franklin FTSE Japan ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Moderate Allocation Fund Class I | I Shares MSCI Emerging Markets Asia ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Moderate Allocation Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.80% |
| Moderate Allocation Fund Class I | Investment Companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.80% |
| Moderate Allocation Fund Class I | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Moderate Allocation Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| Moderate Allocation Fund Class II | Madison Core Bond Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.10% |
| Moderate Allocation Fund Class II | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Moderate Allocation Fund Class II | Madison Investors Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Moderate Allocation Fund Class II | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Moderate Allocation Fund Class II | Invesco S And P 500 Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Moderate Allocation Fund Class II | I Shares Treasury Floating Rate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Moderate Allocation Fund Class II | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Moderate Allocation Fund Class II | Vanguard FTSE Europe ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Moderate Allocation Fund Class II | Franklin FTSE Japan ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Moderate Allocation Fund Class II | I Shares MSCI Emerging Markets Asia ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Moderate Allocation Fund Class II | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.80% |
| Moderate Allocation Fund Class II | Investment Companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.80% |
| Moderate Allocation Fund Class II | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Moderate Allocation Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| Aggressive Allocation Fund Class I | Madison Core Bond Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| Aggressive Allocation Fund Class I | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Aggressive Allocation Fund Class I | Madison Investors Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| Aggressive Allocation Fund Class I | Invesco S And P 500 Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Aggressive Allocation Fund Class I | I Shares Treasury Floating Rate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Aggressive Allocation Fund Class I | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Aggressive Allocation Fund Class I | Vanguard FTSE Europe ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Aggressive Allocation Fund Class I | Franklin FTSE Japan ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Aggressive Allocation Fund Class I | I Shares MSCI Emerging Markets Asia ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Aggressive Allocation Fund Class I | Energy Select Sector SPDR Fund ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Aggressive Allocation Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 62.40% |
| Aggressive Allocation Fund Class I | Investment Companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.50% |
| Aggressive Allocation Fund Class I | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Aggressive Allocation Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.50%) |
| Aggressive Allocation Fund Class II | Madison Core Bond Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| Aggressive Allocation Fund Class II | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Aggressive Allocation Fund Class II | Madison Investors Fund Class R6 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| Aggressive Allocation Fund Class II | Invesco S And P 500 Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Aggressive Allocation Fund Class II | I Shares Treasury Floating Rate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Aggressive Allocation Fund Class II | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Aggressive Allocation Fund Class II | Vanguard FTSE Europe ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Aggressive Allocation Fund Class II | Franklin FTSE Japan ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Aggressive Allocation Fund Class II | I Shares MSCI Emerging Markets Asia ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Aggressive Allocation Fund Class II | Energy Select Sector SPDR Fund ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Aggressive Allocation Fund Class II | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 62.40% |
| Aggressive Allocation Fund Class II | Investment Companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.50% |
| Aggressive Allocation Fund Class II | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Aggressive Allocation Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.50%) |
| Diversified Income Fund Class I | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Diversified Income Fund Class I | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Diversified Income Fund Class I | Madison Covered Call ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.90% |
| Diversified Income Fund Class I | Madison Short Term Strategic Income ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| Diversified Income Fund Class I | Madison Aggregate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.20% |
| Diversified Income Fund Class I | Madison Dividend Value ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| Diversified Income Fund Class I | Global X MLP ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Diversified Income Fund Class I | Vanguard Dividend Appreciation ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Diversified Income Fund Class I | Government National Mortgage Association [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class I | Federal National Mortgage Association [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.10% |
| Diversified Income Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.10%) |
| Diversified Income Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Diversified Income Fund Class I | Collateralized Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class I | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class I | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class II | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Diversified Income Fund Class II | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Diversified Income Fund Class II | Madison Covered Call ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.90% |
| Diversified Income Fund Class II | Madison Short Term Strategic Income ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| Diversified Income Fund Class II | Madison Aggregate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.20% |
| Diversified Income Fund Class II | Madison Dividend Value ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| Diversified Income Fund Class II | Global X MLP ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Diversified Income Fund Class II | Vanguard Dividend Appreciation ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Diversified Income Fund Class II | Government National Mortgage Association [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class II | Federal National Mortgage Association [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class II | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.10% |
| Diversified Income Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.10%) |
| Diversified Income Fund Class II | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Diversified Income Fund Class II | Collateralized Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class II | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Diversified Income Fund Class II | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Core Bond Fund Class I | US Treasury Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Core Bond Fund Class I | US Treasury Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Core Bond Fund Class I | US Treasury Bonds One [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Core Bond Fund Class I | US Treasury Notes One [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Core Bond Fund Class I | Federal Home Loan Mortgage Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Core Bond Fund Class I | Federal National Mortgage Association One [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Core Bond Fund Class I | Federal National Mortgage Association Two [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Core Bond Fund Class I | US Treasury Bonds Two [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Core Bond Fund Class I | Federal Home Loan Mortgage Corp One [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Core Bond Fund Class I | HillsboroSchool District Number One J General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Core Bond Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.60%) |
| Core Bond Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Core Bond Fund Class I | Collateralized Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.40% |
| Core Bond Fund Class I | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Core Bond Fund Class I | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Core Bond Fund Class I | Corporate Notes And Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.90% |
| Core Bond Fund Class I | US Government And Agency Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.30% |
| Core Bond Fund Class I | Foreign Corporate Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Core Bond Fund Class I | Commercial Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Core Bond Fund Class I | Long Term Municipal Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Core Bond Fund Class II | Federal Home Loan Mortgage Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Core Bond Fund Class II | Federal National Mortgage Association One [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Core Bond Fund Class II | U.S. Treasury Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Core Bond Fund Class II | U.S. Treasury Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Core Bond Fund Class II | U.S. Treasury Bonds [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Core Bond Fund Class II | U.S. Treasury Notes [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Core Bond Fund Class II | Federal National Mortgage Association [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Core Bond Fund Class II | custom:U.S .Treasury Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Core Bond Fund Class II | Federal Home Loan Mortgage Corp [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Core Bond Fund Class II | Hillsboro School District No 1J General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Core Bond Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.60%) |
| Core Bond Fund Class II | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Core Bond Fund Class II | Collateralized Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.40% |
| Core Bond Fund Class II | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Core Bond Fund Class II | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Core Bond Fund Class II | Corporate Notes And Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.90% |
| Core Bond Fund Class II | Foreign Corporate Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Core Bond Fund Class II | Commercial Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Core Bond Fund Class II | Long Term Municipal Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Core Bond Fund Class II | U.S. Government And Agency Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.30% |
| High Income Fund Class I | I Sharesi Boxx High Yield Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| High Income Fund Class I | Murphy Oil USA Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| High Income Fund Class I | HCA Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| High Income Fund Class I | United Rentals North America Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| High Income Fund Class I | International Game Technology PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| High Income Fund Class I | SBA Communications Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| High Income Fund Class I | Sunoco LP Sunoco Finance Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| High Income Fund Class I | Waste Pro USA Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| High Income Fund Class I | Performance Food Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| High Income Fund Class I | Frontier Communications Holdings LLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| High Income Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| High Income Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (18.40%) |
| High Income Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.90% |
| High Income Fund Class I | Corporate Notes And Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.40% |
| High Income Fund Class I | Foreign Corporate Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| High Income Fund Class II | I Sharesi Boxx High Yield Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| High Income Fund Class II | Murphy Oil USA Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| High Income Fund Class II | HCA Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| High Income Fund Class II | International Game Technology PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| High Income Fund Class II | SBA Communications Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| High Income Fund Class II | Waste Pro USA Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| High Income Fund Class II | Performance Food Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| High Income Fund Class II | Frontier Communications Holdings LLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| High Income Fund Class II | United Rentals North America Inc [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| High Income Fund Class II | Sunoco LP Sunoco Finance Corp [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| High Income Fund Class II | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| High Income Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (18.40%) |
| High Income Fund Class II | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.90% |
| High Income Fund Class II | Corporate Notes And Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.40% |
| High Income Fund Class II | Foreign Corporate Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Large Cap Value Fund Class I | Next Era Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Large Cap Value Fund Class I | Morgan Stanley [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Value Fund Class I | Automatic Data Processing Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Value Fund Class I | Texas InstrumentsInc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Large Cap Value Fund Class I | Honeywell InternationalInc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Large Cap Value Fund Class I | Fastenal Co. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Large Cap Value Fund Class I | Home Depot Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Large Cap Value Fund Class I | Medtronic PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Large Cap Value Fund Class I | EOG Resources Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Large Cap Value Fund Class I | Comcast Corp .Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Large Cap Value Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Large Cap Value Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Large Cap Value Fund Class I | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.20% |
| Large Cap Value Fund Class I | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| Large Cap Value Fund Class I | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Large Cap Value Fund Class I | Energy [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.20% |
| Large Cap Value Fund Class I | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| Large Cap Value Fund Class I | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Large Cap Value Fund Class I | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Large Cap Value Fund Class I | Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Large Cap Value Fund Class I | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Large Cap Value Fund Class I | Equity Real Estate Investment Trusts REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Large Cap Value Fund Class I | Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Large Cap Value Fund Class II | Next Era Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Large Cap Value Fund Class II | Morgan Stanley [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Value Fund Class II | Automatic Data Processing Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Value Fund Class II | Texas InstrumentsInc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Large Cap Value Fund Class II | Honeywell InternationalInc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Large Cap Value Fund Class II | Fastenal Co. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Large Cap Value Fund Class II | Home Depot Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Large Cap Value Fund Class II | Medtronic PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Large Cap Value Fund Class II | EOG Resources Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Large Cap Value Fund Class II | Comcast Corp .Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Large Cap Value Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Large Cap Value Fund Class II | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Large Cap Value Fund Class II | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.20% |
| Large Cap Value Fund Class II | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| Large Cap Value Fund Class II | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Large Cap Value Fund Class II | Energy [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.20% |
| Large Cap Value Fund Class II | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| Large Cap Value Fund Class II | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Large Cap Value Fund Class II | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Large Cap Value Fund Class II | Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Large Cap Value Fund Class II | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Large Cap Value Fund Class II | Equity Real Estate Investment Trusts REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Large Cap Value Fund Class II | Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Large Cap Growth Fund Class I | Alphabet Inc Class C [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Large Cap Growth Fund Class I | Arch Capital Group Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Large Cap Growth Fund Class I | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Large Cap Growth Fund Class I | Fiserv Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Large Cap Growth Fund Class I | PACCAR Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Large Cap Growth Fund Class I | Analog Devices Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Large Cap Growth Fund Class I | TJX Cos Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Large Cap Growth Fund Class I | Berkshire Hathaway Inc. Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Large Cap Growth Fund Class I | Alcon Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Growth Fund Class I | Parker Hannifin Corp. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Growth Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Large Cap Growth Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Large Cap Growth Fund Class I | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.30% |
| Large Cap Growth Fund Class I | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.10% |
| Large Cap Growth Fund Class I | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Large Cap Growth Fund Class I | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| Large Cap Growth Fund Class I | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Large Cap Growth Fund Class I | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Large Cap Growth Fund Class I | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Large Cap Growth Fund Class II | Alphabet Inc Class C [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Large Cap Growth Fund Class II | Arch Capital Group Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Large Cap Growth Fund Class II | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Large Cap Growth Fund Class II | Fiserv Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Large Cap Growth Fund Class II | PACCAR Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Large Cap Growth Fund Class II | Analog Devices Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Large Cap Growth Fund Class II | TJX Cos Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Large Cap Growth Fund Class II | Berkshire Hathaway Inc. Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Large Cap Growth Fund Class II | Alcon Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Growth Fund Class II | Parker Hannifin Corp. [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Large Cap Growth Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Large Cap Growth Fund Class II | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Large Cap Growth Fund Class II | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.30% |
| Large Cap Growth Fund Class II | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.10% |
| Large Cap Growth Fund Class II | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Large Cap Growth Fund Class II | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| Large Cap Growth Fund Class II | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Large Cap Growth Fund Class II | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Large Cap Growth Fund Class II | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Mid Cap Fund Class I | Arch Capital Group Ltd [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Mid Cap Fund Class I | Gartner Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Mid Cap Fund Class I | Ross Stores Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Mid Cap Fund Class I | Brown And Brown Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Mid Cap Fund Class I | Copart Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Mid Cap Fund Class I | PACCAR Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Mid Cap Fund Class I | Carlisle Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Mid Cap Fund Class I | Amphenol Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Mid Cap Fund Class I | Dollar Tree Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Mid Cap Fund Class I | CDW Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Mid Cap Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.50%) |
| Mid Cap Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Mid Cap Fund Class I | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.60% |
| Mid Cap Fund Class I | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.90% |
| Mid Cap Fund Class I | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Mid Cap Fund Class I | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Mid Cap Fund Class I | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Mid Cap Fund Class I | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| Mid Cap Fund Class I | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Mid Cap Fund Class II | Arch Capital Group Ltd [Member] [Default Label] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Mid Cap Fund Class II | Gartner Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Mid Cap Fund Class II | Ross Stores Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Mid Cap Fund Class II | Brown And Brown Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Mid Cap Fund Class II | Copart Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Mid Cap Fund Class II | PACCAR Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Mid Cap Fund Class II | Carlisle Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Mid Cap Fund Class II | Amphenol Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Mid Cap Fund Class II | Dollar Tree Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Mid Cap Fund Class II | CDW Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Mid Cap Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.50%) |
| Mid Cap Fund Class II | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Mid Cap Fund Class II | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.60% |
| Mid Cap Fund Class II | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.90% |
| Mid Cap Fund Class II | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Mid Cap Fund Class II | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Mid Cap Fund Class II | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Mid Cap Fund Class II | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| Mid Cap Fund Class II | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| International Stock Fund Class I | JAPAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| International Stock Fund Class I | GERMANY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| International Stock Fund Class I | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| International Stock Fund Class I | FRANCE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| International Stock Fund Class I | INDIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| International Stock Fund Class I | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| International Stock Fund Class I | CHINA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| International Stock Fund Class I | MEXICO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| International Stock Fund Class I | CANADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| International Stock Fund Class I | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| International Stock Fund Class I | HONG KONG | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| International Stock Fund Class I | TAIWAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| International Stock Fund Class I | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| International Stock Fund Class I | IRELAND | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| International Stock Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| International Stock Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| International Stock Fund Class I | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| International Stock Fund Class I | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| International Stock Fund Class I | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| International Stock Fund Class I | Energy [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| International Stock Fund Class I | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| International Stock Fund Class I | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| International Stock Fund Class I | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.30% |
| International Stock Fund Class I | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| International Stock Fund Class I | Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| International Stock Fund Class II | JAPAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| International Stock Fund Class II | GERMANY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| International Stock Fund Class II | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| International Stock Fund Class II | FRANCE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| International Stock Fund Class II | INDIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| International Stock Fund Class II | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| International Stock Fund Class II | CHINA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| International Stock Fund Class II | MEXICO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| International Stock Fund Class II | CANADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| International Stock Fund Class II | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| International Stock Fund Class II | HONG KONG | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| International Stock Fund Class II | TAIWAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| International Stock Fund Class II | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| International Stock Fund Class II | IRELAND | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| International Stock Fund Class II | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| International Stock Fund Class II | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| International Stock Fund Class II | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| International Stock Fund Class II | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| International Stock Fund Class II | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| International Stock Fund Class II | Energy [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| International Stock Fund Class II | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| International Stock Fund Class II | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| International Stock Fund Class II | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.30% |
| International Stock Fund Class II | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| International Stock Fund Class II | Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Madison Target Retirement 2020 Fund Class I | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Madison Target Retirement 2020 Fund Class I | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Madison Target Retirement 2020 Fund Class I | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| Madison Target Retirement 2020 Fund Class I | SPDR Portfolio Short Term Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Madison Target Retirement 2020 Fund Class I | I Shares Seven To Ten Year Treasury Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| Madison Target Retirement 2020 Fund Class I | I Shares MBS ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Madison Target Retirement 2020 Fund Class I | Invesco S And P Five Hundred Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Madison Target Retirement 2020 Fund Class I | Distillate US Fundamental Stability And Value ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Madison Target Retirement 2020 Fund Class I | Vanguard Extended Duration Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Madison Target Retirement 2020 Fund Class I | I Shares MSCI International Quality Factor ETF Class USDINC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Madison Target Retirement 2020 Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Madison Target Retirement 2020 Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Madison Target Retirement 2020 Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Madison Target Retirement 2030 Fund Class I | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Madison Target Retirement 2030 Fund Class I | I Shares Aaa A Rated Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Madison Target Retirement 2030 Fund Class I | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| Madison Target Retirement 2030 Fund Class I | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Madison Target Retirement 2030 Fund Class I | SPDR Portfolio Short Term Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| Madison Target Retirement 2030 Fund Class I | I Shares Seven To Ten Year Treasury Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Madison Target Retirement 2030 Fund Class I | I Shares MBS ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Madison Target Retirement 2030 Fund Class I | Invesco S And P Five Hundred Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| Madison Target Retirement 2030 Fund Class I | Distillate US Fundamental Stability And Value ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Madison Target Retirement 2030 Fund Class I | I Shares MSCI International Quality Factor ETF Class USDINC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Madison Target Retirement 2030 Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Madison Target Retirement 2030 Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Madison Target Retirement 2030 Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Madison Target Retirement 2040 Fund Class I | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Madison Target Retirement 2040 Fund Class I | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Madison Target Retirement 2040 Fund Class I | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Madison Target Retirement 2040 Fund Class I | I Shares MSCI Emerging Markets Asia ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Madison Target Retirement 2040 Fund Class I | SPDR Portfolio Short Term Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Madison Target Retirement 2040 Fund Class I | I Shares Seven To Ten Year Treasury Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| Madison Target Retirement 2040 Fund Class I | I Shares MBS ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Madison Target Retirement 2040 Fund Class I | Invesco S And P Five Hundred Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.90% |
| Madison Target Retirement 2040 Fund Class I | Distillate US Fundamental Stability And Value ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| Madison Target Retirement 2040 Fund Class I | I Shares MSCI International Quality Factor ETF Class USDINC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Madison Target Retirement 2040 Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.80% |
| Madison Target Retirement 2040 Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Madison Target Retirement 2040 Fund Class I | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Madison Target Retirement 2050 Fund Class I | Schwab Intermediate Term US Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Madison Target Retirement 2050 Fund Class I | Janus Henderson Mortgage Backed Securities ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Madison Target Retirement 2050 Fund Class I | Vanguard Information Technology ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| Madison Target Retirement 2050 Fund Class I | I Shares MSCI Emerging Markets Asia ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Madison Target Retirement 2050 Fund Class I | SPDR Portfolio Short Term Treasury ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Madison Target Retirement 2050 Fund Class I | I Shares Seven To Ten Year Treasury Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Madison Target Retirement 2050 Fund Class I | Invesco S And P Five Hundred Quality ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.80% |
| Madison Target Retirement 2050 Fund Class I | Distillate US Fundamental Stability And Value ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Madison Target Retirement 2050 Fund Class I | I Shares MSCI International Quality Factor ETF Class USDINC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Madison Target Retirement 2050 Fund Class I | JP Morgan Beta Builders Japan ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Madison Target Retirement 2050 Fund Class I | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 96.70% |
| Madison Target Retirement 2050 Fund Class I | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Madison Target Retirement 2050 Fund Class I | Other Assets And Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
