Centre American Select Equity Fund | Advisor Class Information Technology Industrials Materials Financials Energy Real Estate [Member] Health Care [Member] Consumer Staples Communication Services Cash & Other Investment Type [Axis] NVIDIA Corp. Apple, Inc. Nucor Corp. Broadcom, Inc. Microchip Technology, Inc. Newmont Goldcorp Corp. Air Products & Chemicals, Inc. Antero Resources Corp. Analog Devices, Inc. Rockwell Automation, Inc. Centre American Select Equity Fund | Investor Class Centre Global Infrastructure Fund | Advisor Class Oil, Gas & Consumable Fuels Diversified Telecommunication Services Electric Utilities Wireless Telecommunication Services Multi-Utilities Electrical Equipment Transportation Infrastructure Health Care Providers & Services Enbridge, Inc. Verizon Communications, Inc. SoftBank Group Corp. AT&T, Inc. Williams Cos., Inc. Deutsche Telekom AG TC Energy Corp. HCA Healthcare, Inc. Kinder Morgan, Inc. NextEra Energy, Inc. UNITED STATES CANADA JAPAN GERMANY FRANCE SPAIN UNITED KINGDOM SWITZERLAND AUSTRALIA Centre Global Infrastructure Fund | Investor Class Horizon Active Asset Allocation Fund | Investor Class Consumer Discretionary Utilities CHINA TAIWAN HONG KONG NETHERLANDS Exchange Traded Funds [Member] Common Stocks Investments Purchased with Proceeds from Securities Lending Money Market Funds [Member] Purchased Options Written Options Horizon Active Asset Allocation Fund | Advisor Class Horizon Active Asset Allocation Fund | Institutional Class Horizon Active Income Fund | Investor Class Horizon Active Income Fund | Advisor Class Horizon Active Income Fund | Institutional Class Horizon Active Risk Assist Fund | Investor Class Finance and Insurance Horizon Active Risk Assist Fund | Advisor Class Horizon Active Risk Assist Fund | Institutional Class Horizon Defensive Core Fund | Investor Class Real Estate Investment Trusts Horizon Defensive Core Fund | Advisor Class Horizon Defined Risk Fund | Investor Class Rights [Member] Horizon Defined Risk Fund | Advisor Class Horizon Equity Premium Income Fund | Investor Class Horizon Equity Premium Income Fund | Advisor Class Horizon Multi-Factor Small/Mid Cap Fund | Investor Class Horizon Multi-Factor Small/Mid Cap Fund | Advisor Class Horizon Multi-Factor U.S. Equity Fund | Investor Class Horizon Multi-Factor U.S. Equity Fund | Advisor Class Horizon Tactical Fixed Income Fund | Investor Class Horizon Tactical Fixed Income Fund | Advisor Class Horizon Core Bond ETF Horizon Core Equity ETF Horizon Digital Frontier ETF Horizon Dividend Income ETF Horizon Expedition Plus ETF Horizon Flexible Income ETF Horizon International Equity ETF KOREA, REPUBLIC OF Preferred Stocks Horizon International Managed Risk ETF Horizon Landmark ETF Horizon Managed Risk ETF Horizon Nasdaq-100 Defined Risk ETF Horizon Small/Mid Cap Core Equity ETF Net Assets Investment Company, Portfolio Turnover