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Capital Stock and Reserves - Additional Information (Details) $ / shares in Units, ¥ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 CNY (¥) shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2020 $ / shares | Dec. 31, 2020 USD ($) shares | Sep. 30, 2021 CNY (¥) shares | Apr. 30, 2021 USD ($) | Jun. 11, 2020 shares | Jul. 01, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation costs recorded for the period | $ 6,100,000 |  |  | $ 5,300,000 | $ 18,200,000 |  | $ 16,000,000.0 |  |  |  |  |  |
Stock-based compensation expense | $ 6,109,000 |  |  | $ 5,310,000 | $ 18,211,000 |  | $ 15,969,000 |  |  |  |  |  |
Maximum number of shares of common stock may be issued for outstanding PSU | shares | 59,082,275 |  | 59,082,275 |  | 59,082,275 | 59,082,275 |  |  | 58,921,731 | 59,082,275 |  |  |
Common shares purchased in open market by trustee in connection with RSUs | shares | 0 | 0 |  |  | 0 |  | 200,000 |  |  |  |  |  |
Weighted average price of common shares purchased in open market by trustee in connection with RSUs | $ / shares |  |  |  |  |  |  | $ 15.43 |  |  |  |  |  |
Number of treasury shares held in trust for future settlement of share based awards | shares |  |  |  |  | 276 |  |  |  | 723 |  |  |  |
Value of treasury shares held in trust for future settlement of RSUs and stock options | $ 4,000 |  | $ 4,000 |  | $ 4,000 | $ 4,000 |  |  | $ 11,000 |  |  |  |
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares | 6,115,389 | 6,115,389 |  | 6,959,515 | 6,115,389 |  | 6,959,515 |  |  |  |  |  |
Percentage of statutory net profits to statutory surplus reserve to be appropriated. | 10.00% |  | 10.00% |  | 10.00% | 10.00% |  |  |  | 10.00% |  |  |
Discontinuation of contribution, Aggregate sum of statutory surplus reserve more than its registered capital,percent. | 50.00% |  | 50.00% |  | 50.00% | 50.00% |  |  |  | 50.00% |  |  |
Statutory surplus reserve appropriated | $ 5,600,000 |  | $ 5,600,000 |  | $ 5,600,000 | $ 5,600,000 |  |  |  | ¥ 36.4 |  |  |
Dividends declared and paid | $ 20,400,000 | ¥ 131.6 |  |  |  |  |  |  |  |  |  |  |
Statutory surplus reserve to its subsidiaries registered capital percent | 50.00% |  | 50.00% |  | 50.00% | 50.00% |  |  |  | 50.00% |  |  |
IMAX China |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Details of the share repurchase program |  |  |  |  | In 2021, IMAX China announced that its shareholders granted its Board of Directors a general mandate authorizing the Board, subject to applicable laws, to repurchase of shares of IMAX China not to exceed 10% of the total number of issued shares as of May 6, 2021 (34,835,824 shares). This program will be valid until the 2022 Annual General Meeting of IMAX China. The repurchases may be made in the open market or through other means permitted by applicable laws. IMAX China has no obligation to repurchase its shares and the share repurchase program may be suspended or discontinued by IMAX China at any time. |  |  |  |  |  |  |  |
Stock Repurchase Program Expiration Date |  |  |  |  | May 06, 2021 |  |  |  |  |  |  |  |
Repurchase of common shares | shares | 3,569,000 | 3,569,000 |  |  | 3,569,000 |  | 906,400 |  |  |  |  |  |
Stock Acquired, Average Cost per Share | (per share) | $ 1.40 |  | $ 10.90 |  | $ 1.40 | $ 10.90 | $ 1.69 | $ 13.13 |  |  |  |  |
Stock Repurchase Program, maximum percentage of shares to be repurchased |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Stock Repurchase Program, Authorized number of shares | shares |  |  |  |  |  |  |  |  |  |  |  | 34,835,824 |
Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Details of the share repurchase program |  |  |  |  | In April 2021, the Company’s Board of Directors approved a 12-month extension to its share repurchase program through June 30, 2022. The extension authorized the Company to repurchase up to approximately $89.4 million worth of common shares, the remaining amount available of the original $200.0 million initially authorized under the share repurchase program when it commenced on July 1, 2017. The repurchases may be made either in the open market or through private transactions, including repurchases made pursuant a plan intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, subject to market conditions, applicable legal requirements, and other relevant factors. The Company has no obligation to repurchase shares and the share repurchase program may be suspended or discontinued by the Company at any time. |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0
Stock Repurchase Program Expiration Date |  |  |  |  | Jun. 30, 2022 |  |  |  |  |  |  |  |
Repurchase of common shares | shares | 316,812 | 316,812 |  |  | 316,812 |  | 2,484,123 |  |  |  |  |  |
Stock Acquired, Average Cost per Share | $ / shares | $ 14.53 |  |  |  | $ 14.53 |  | $ 14.72 |  |  |  |  |  |
Statutory surplus reserve appropriated | $ 3,900 |  | $ 3,900 |  | $ 3,900 | $ 3,900 |  |  |  |  |  |  |
Non-controlling Interests [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory surplus reserve appropriated | 1,700 |  | 1,700 |  | 1,700 | 1,700 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Value of treasury shares held in trust for future settlement of RSUs and stock options | 100,000 |  | $ 100,000 |  | 100,000 | $ 100,000 |  |  | $ 100,000 |  |  |  |
Maximum [Member] | Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  | $ 89,400,000 |  |
Restricted Share Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 3,900,000 |  |  | $ 3,430,000 | $ 11,524,000 |  | $ 10,866,000 |  |  |  |  |  |
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares | 1,592,965 | 1,592,965 |  | 1,674,348 | 1,592,965 |  | 1,674,348 |  |  |  |  |  |
Restricted Share Units [Member] | Minimum [Member] | Certain Advisor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 253,000 |  |  | $ 433,000 | $ 808,000 |  | $ 1,449,000 |  |  |  |  |  |
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares | 3,738,504 | 3,738,504 |  | 4,917,428 | 3,738,504 |  | 4,917,428 |  |  |  |  |  |
Performance Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 1,183,000 |  |  | $ 483,000 | $ 3,169,000 |  | $ 1,229,000 |  |  |  |  |  |
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares | 783,920 | 783,920 |  | 367,739 | 783,920 |  | 367,739 |  |  |  |  |  |
Performance Stock Units [Member] | Maximum [Member] | EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares of common stock may be issued for outstanding PSU | shares | 1,079,372 |  | 1,079,372 |  | 1,079,372 | 1,079,372 |  |  |  | 1,079,372 |  |  |

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