General (Policies)	9 Months Ended
General (Policies)	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Lionsgate and all of its majority-owned and controlled subsidiaries. The unaudited condensed consolidated financial statements have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to quarterly report on Form 10-Q under the Securities Exchange Act of 1934, as amended, and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of the Company’s management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation have been reflected in these unaudited condensed consolidated financial statements. Operating results for the three and nine months ended December 31, 2016 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2017. The balance sheet at March 31, 2016 has been derived from the audited financial statements at that date, but does not include all the information and footnotes required by U.S. GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements should be read together with the consolidated financial statements and related notes included in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2016.
Balance Sheet Reclassification	Balance Sheet Reclassifications: Certain amounts presented in prior periods have been reclassified to conform to the current period presentation. Historically, the Company has presented an unclassified balance sheet. As a result of the merger with Starz (see Note 2), the Company is now presenting a classified balance sheet and, accordingly, reclassification adjustments to the Company's historical unclassified balance sheet have been made to present an unaudited condensed consolidated classified balance sheet. In addition to these reclassification adjustments, the Company has made the following reclassifications to the unaudited condensed consolidated balance sheet as of March 31, 2016 to conform to the current year presentation: (i) reclassified $21 million of product inventory from investment in film and television programs to other current assets; (ii) reclassified $222 million of long-term accounts receivable to other non-current assets; (iii) reclassified $190 million of short-term tax credits receivable to other current assets and $67 million of long-term tax credits receivable to other non-current assets; (iv) reclassified $11 million of intangible assets from other assets to the new separate line item for intangible assets; (v) reclassified the carrying value of its previous senior revolving credit facility ($156 million), former 5.25% senior notes ($221 million), former term loan ($388 million) and convertible senior subordinated notes ($100 million) into the new separate line item for debt (current and non-current) on the unaudited condensed consolidated balance sheet.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. The most significant estimates made by management in the preparation of the financial statements relate to ultimate revenue and costs used for the amortization of investment in films and television programs; the allocations made in connection with the amortization of program rights; estimates of sales returns and other allowances and provisions for doubtful accounts; fair value of equity-based compensation; fair value of assets and liabilities for allocation of the purchase price of companies acquired; income taxes including the assessment of valuation allowances for deferred tax assets; accruals for contingent liabilities; and impairment assessments for investment in films and television programs, property and equipment, equity investments, goodwill and intangible assets. Actual results could differ from such estimates.
Program Rights	Program Rights: The cost of program rights for films and television programs exhibited on the Starz premium networks are generally amortized on a title-by-title or episode-by-episode basis over the anticipated number of exhibitions. The number of exhibitions is estimated based on the number of exhibitions allowed in the agreement (if specified) and the expected usage of the content. Certain other program rights are amortized to expense on a straight-line basis over the respective lives of the agreements. Programming rights may include rights to more than one exploitation window under its output and library agreements. For films with multiple windows, the license fee is allocated between the windows based upon the proportionate estimated fair value of each window which generally results in the majority of the cost allocated to the first window. The cost of original series in the Company's new Media Networks reporting segment (see Note 15) is allocated between the pay television market, and the ancillary revenue markets (e.g., home video, digital platforms, international television, etc.) based on the estimated relative fair values of these markets. The amount associated with the pay television market is reclassified from investment in film and television programs to program rights when the program is aired and the portion attributable to the ancillary markets remains in investment in films and television programs within the Media Networks segment. All the costs of original programming that is produced by the Media Networks segment are classified as long term. Amounts included in program rights, other than internally produced programming, that are expected to be amortized within a year from the balance sheet date are classified as short-term.
Revenue Recognition	Revenue Recognition: Programming revenue is recognized in the period during which programming is provided, pursuant to affiliation agreements. If an affiliation agreement has expired, revenue is recognized based on the terms of the expired agreement or the actual payment from the distributor, whichever is less. Any funds received in excess of fixed and determinable programming revenue are recorded as a liability in deferred revenue until the discrepancy is resolved. Payments to distributors for marketing support costs for which the Company does not receive a direct benefit are recorded as a reduction of revenue.
Advertising and Marketing Costs	Advertising and Marketing Costs: Advertising and marketing costs are expensed as incurred. Certain of Starz’s affiliation agreements require Starz to provide marketing support to the distributor based upon certain criteria as stipulated in the agreements. Marketing support includes cooperative advertising and marketing efforts between Starz and its distributors such as cross channel, direct mail and point of sale incentives. Marketing support is recorded as an expense and not a reduction of revenue when Starz has received a direct benefit and the fair value of such benefit is determinable.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Revenue Recognition: In May 2014, the Financial Accounting Standards Board (the "FASB") issued an accounting standard update relating to the recognition of revenue from contracts with customers, which will supersede most current U.S. GAAP revenue recognition guidance, including industry-specific guidance. The new revenue recognition standard provides a five-step analysis of transactions to determine when and how revenue is recognized. Based on the current guidance, the new framework will become effective on either a full or modified retrospective basis for the Company on April 1, 2018. The Company is currently evaluating the impact that the adoption of this new guidance will have on its consolidated financial statements. Presentation of Debt Issuance Costs: In April 2015, the FASB issued an accounting standards update relating to the presentation of debt issuance costs. The accounting update requires companies to present debt issuance costs related to a recognized debt liability as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts, rather than as an asset. The guidance is effective for the Company's fiscal year beginning April 1, 2016, and must be applied on a retrospective basis to all prior periods presented in the financial statements. The Company adopted the new guidance effective April 1, 2016, which resulted in the reclassification of approximately $21 million of debt issuance costs from other assets to their respective debt liabilities in the unaudited condensed consolidated balance sheets as of March 31, 2016. Balance Sheet Classification of Deferred Taxes: In April 2015, the FASB issued guidance to simplify the presentation of deferred income taxes, which removes the requirement to separate deferred tax liabilities and assets into current and non-current amounts and instead requires all such amounts be classified as non-current on the Company's consolidated balance sheets. The guidance is effective for the Company's fiscal year beginning April 1, 2017, with early adoption permitted, and can be adopted on either a retrospective or prospective basis. The Company adopted the new guidance on a retrospective basis effective October 1, 2016. As discussed in Note 1, the Company previously presented an unclassified balance sheet and upon changing to presenting a classified balance sheet, all deferred tax assets and liabilities have been classified as long-term. Recognition and Measurement of Financial Instruments: In January 2016, the FASB issued new guidance that addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Among other provisions, the new guidance requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. For investments without readily determinable fair values, entities have the option to either measure these investments at fair value or at cost adjusted for changes in observable prices minus impairment. The guidance is effective for the Company's fiscal year beginning April 1, 2018. Early adoption is not permitted, except for certain provisions relating to financial liabilities. The Company is currently evaluating the impact that the adoption of this new guidance will have on its consolidated financial statements. Accounting for Leases: In February 2016, the FASB issued guidance on accounting for leases which requires lessees to recognize most leases on their balance sheets for the rights and obligations created by those leases. The new guidance also requires additional qualitative and quantitative disclosures related to the nature, timing and uncertainty of cash flows arising from leases. The guidance is effective for the Company's fiscal year beginning April 1, 2019, with early adoption permitted, and is required to be implemented using a modified retrospective approach. The Company is currently evaluating the impact that the adoption of this new guidance will have on its consolidated financial statements. Employee Share-Based Payment Accounting: In March 2016, the FASB issued amended guidance related to employee share-based payment accounting. One aspect of the guidance, which will become effective on a prospective basis, requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. In addition, the guidance eliminates the requirement that excess tax benefits be realized (i.e., through a reduction in income taxes payable) before companies can recognize them. This part of the guidance will be applied using a modified retrospective transition method and will result in the Company recording a cumulative-effect adjustment in retained earnings for excess tax benefits not previously recognized. The guidance also requires presentation of excess tax benefits as an operating activity on the statement of cash flows rather than as a financing activity, and can be applied retrospectively or prospectively. The guidance also increases the amount companies can withhold to cover income taxes on awards without triggering liability classification for shares used to satisfy statutory income tax withholding obligations and requires application of a modified retrospective transition method. Finally, the guidance provides for an election to account for forfeitures of share-based payments either by (1) recognizing forfeitures of awards as they occur or (2) estimating the number of awards expected to be forfeited and adjusting the estimate when it is likely to change (as is required under the current guidance). The guidance is effective for the Company's fiscal year beginning April 1, 2017. The Company is currently evaluating the impact that the adoption of this new guidance will have on its consolidated financial statements. Equity Method of Accounting: In March 2016, the FASB issued guidance that changes the requirements for equity method accounting when an investment qualifies for use of the equity method as a result of an increase in the investor’s ownership interest in or degree of influence over an investee. The guidance (i) eliminates the need to retroactively apply the equity method of accounting upon qualifying for such treatment, (ii) requires that the cost of acquiring the additional interest in an investee be added to the basis of the previously held interest and (iii) requires that unrealized holding gains or losses for available-for-sale equity securities that qualify for the equity method of accounting be recognized in earnings at the date the investment becomes qualified for use of the equity method of accounting. The guidance is effective for the Company's fiscal year beginning April 1, 2017. The adoption of this guidance is not expected to have a material impact on the Company's consolidated financial statements. Classification of Certain Cash Receipts and Cash Payments: In August 2016, the FASB issued guidance that clarifies how entities should classify certain cash receipts and payments on the statement of cash flows. The guidance primarily relates to the classification of cash flows associated with certain (i) debt transactions including debt prepayment or extinguishment costs, (ii) contingent consideration arrangements related to a business combination, (iii) insurance claims and policies, (iv) distributions from equity method investees and (v) securitization transactions. This guidance is effective for the Company's fiscal year beginning April 1, 2018, with early adoption permitted. The Company is currently evaluating the impact that the adoption of this new guidance will have on its statement of cash flows. Restricted Cash: In November 2016, the FASB issued guidance to clarify how entities should present restricted cash and restricted cash equivalents in the statement of cash flows. The guidance requires entities to show the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. The guidance will be applied retrospectively and is effective for the Company’s fiscal year beginning April 1, 2018, with early adoption permitted. The adoption of this guidance is not expected to have a material impact on the Company's consolidated financial statements.
Net Income (Loss) Per Share	Basic net income (loss) per share is calculated based on the weighted average common shares outstanding for the period. Diluted net income (loss) per common share reflects the potential dilutive effect, if any, of the conversion of convertible senior subordinated notes under the "if converted" method. Diluted net income (loss) per common share also reflects share purchase options, including equity-settled share appreciation rights, restricted share units ("RSUs") and restricted stock using the treasury stock method when dilutive, and any contingently issuable shares when dilutive.