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Discontinued Operations (Details Textual) Sheet http://www.rhythmone.com/20180331/role/statement-note-6-discontinued-operations-details-textual Note 6 - Discontinued Operations (Details Textual) Uncategorized 72 false false R73.htm 072 - Disclosure - Note 6 - Discontinued Operations - Summary of Discontinued Operations (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-6-discontinued-operations-summary-of-discontinued-operations-details Note 6 - Discontinued Operations - Summary of Discontinued Operations (Details) Uncategorized 73 false false R74.htm 073 - Disclosure - Note 7 - Business Combinations (Details Textual) Sheet http://www.rhythmone.com/20180331/role/statement-note-7-business-combinations-details-textual Note 7 - Business Combinations (Details Textual) Uncategorized 74 false false R75.htm 074 - Disclosure - Note 7 - Business Combinations - Components of Business Combinations (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-7-business-combinations-components-of-business-combinations-details Note 7 - 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Disclosure - Note 9 - Auditor's Remuneration - Components of Auditor's Remuneration (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-9-auditors-remuneration-components-of-auditors-remuneration-details Note 9 - Auditor's Remuneration - Components of Auditor's Remuneration (Details) Uncategorized 79 false false R80.htm 079 - Disclosure - Note 10 - Staff Costs - Sales, Marketing, Research, Development, Administration and Operations Expense (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-10-staff-costs-sales-marketing-research-development-administration-and-operations-expense-details Note 10 - Staff Costs - Sales, Marketing, Research, Development, Administration and Operations Expense (Details) Uncategorized 80 false false R81.htm 080 - Disclosure - Note 10 - Staff Costs - Components of Staff Costs (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-10-staff-costs-components-of-staff-costs-details Note 10 - Staff Costs - Components of Staff Costs (Details) Uncategorized 81 false false R82.htm 081 - Disclosure - Note 11 - Finance Income and Expense from Continuing Operations - Components of Finance Income (Cost) (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-11-finance-income-and-expense-from-continuing-operations-components-of-finance-income-cost-details Note 11 - Finance Income and Expense from Continuing Operations - Components of Finance Income (Cost) (Details) Uncategorized 82 false false R83.htm 082 - Disclosure - Note 12 - Income Tax Charge / (Credit) (Details Textual) Sheet http://www.rhythmone.com/20180331/role/statement-note-12-income-tax-charge-credit-details-textual Note 12 - Income Tax Charge / (Credit) (Details Textual) Uncategorized 83 false false R84.htm 083 - Disclosure - Note 12 - Income Tax Charge / (Credit) - Components of Income Tax (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-12-income-tax-charge-credit-components-of-income-tax-details Note 12 - Income Tax Charge / (Credit) - Components of Income Tax (Details) Uncategorized 84 false false R85.htm 084 - 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Disclosure - Note 18 - Other Receivables and Restricted Cash - Components of Other Receivables and Restricted Cash (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-18-other-receivables-and-restricted-cash-components-of-other-receivables-and-restricted-cash-details Note 18 - Other Receivables and Restricted Cash - Components of Other Receivables and Restricted Cash (Details) Uncategorized 96 false false R97.htm 096 - Disclosure - Note 18 - Other Receivables and Restricted Cash - Allowance for Doubtful Debts (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-18-other-receivables-and-restricted-cash-allowance-for-doubtful-debts-details Note 18 - Other Receivables and Restricted Cash - Allowance for Doubtful Debts (Details) Uncategorized 97 false false R98.htm 097 - Disclosure - Note 18 - Other Receivables and Restricted Cash - Aging of Past Due Receivables (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-18-other-receivables-and-restricted-cash-aging-of-past-due-receivables-details Note 18 - 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Disclosure - Note 26 - Operating Lease Arrangements - Financial Statement Amounts (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-26-operating-lease-arrangements-financial-statement-amounts-details Note 26 - Operating Lease Arrangements - Financial Statement Amounts (Details) Uncategorized 115 false false R116.htm 115 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes (Details Textual) Sheet http://www.rhythmone.com/20180331/role/statement-note-27-sharebased-payment-and-equity-settled-share-option-schemes-details-textual Note 27 - Share-Based Payment and Equity Settled Share Option Schemes (Details Textual) Uncategorized 116 false false R117.htm 116 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes - Share-Based Compensation Expense (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-27-sharebased-payment-and-equity-settled-share-option-schemes-sharebased-compensation-expense-details Note 27 - 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RSU's (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-27-sharebased-payment-and-equity-settled-share-option-schemes-rsus-details Note 27 - Share-Based Payment and Equity Settled Share Option Schemes - RSU's (Details) Uncategorized 120 false false R121.htm 120 - Disclosure - Note 28 - Financial Instruments (Details Textual) Sheet http://www.rhythmone.com/20180331/role/statement-note-28-financial-instruments-details-textual Note 28 - Financial Instruments (Details Textual) Uncategorized 121 false false R122.htm 121 - Disclosure - Note 28 - Financial Instruments - Financial Assets and Liabilities (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-28-financial-instruments-financial-assets-and-liabilities-details Note 28 - Financial Instruments - Financial Assets and Liabilities (Details) Uncategorized 122 false false R123.htm 122 - Disclosure - Note 28 - Financial Instruments - Currency Risk (Details) Sheet http://www.rhythmone.com/20180331/role/statement-note-28-financial-instruments-currency-risk-details Note 28 - 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