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Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock Shares | Additional Paid-in Capital | Additional Paid-in Capital 2.875% Convertible senior notes, due 2028 | Additional Paid-in Capital 2.875% Convertible senior notes, due 2024 | Additional Paid-in Capital 2.25% Convertible senior notes, due 2024 | Retained Earnings | Retained Earnings Cumulative Effect Adjustment Due to Adoption | Accumulated Other Comprehensive (Loss) | Total Equity - Greenbrier | Total Equity - Greenbrier 2.875% Convertible senior notes, due 2028 | Total Equity - Greenbrier 2.875% Convertible senior notes, due 2024 | Total Equity - Greenbrier 2.25% Convertible senior notes, due 2024 | Total Equity - Greenbrier Cumulative Effect Adjustment Due to Adoption | Noncontrolling Interest | Equity Excluding Contingently Redeemable Noncontrolling Interest | Equity Excluding Contingently Redeemable Noncontrolling Interest 2.875% Convertible senior notes, due 2028 | Equity Excluding Contingently Redeemable Noncontrolling Interest 2.875% Convertible senior notes, due 2024 | Equity Excluding Contingently Redeemable Noncontrolling Interest 2.25% Convertible senior notes, due 2024 | Equity Excluding Contingently Redeemable Noncontrolling Interest Cumulative Effect Adjustment Due to Adoption | Contingently Redeemable Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Aug. 31, 2019 |  |  | $ 453,943 |  |  |  | $ 867,602 | $ 4,393 | $ (44,815) | $ 1,276,730 |  |  |  | $ 4,393 | $ 164,967 | $ 1,441,697 |  |  |  | $ 4,393 |
Beginning balance (in shares) at Aug. 31, 2019 |  | 32,488 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Aug. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,564
Accounting Standards Update [Extensible List] |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |
Net earnings (loss) | $ 79,895 |  |  |  |  |  | $ 49,070 |  |  | $ 49,070 |  |  |  |  | 31,778 | $ 80,848 |  |  |  |  |
Other comprehensive income (loss), net | (18,260) |  |  |  |  |  |  |  | (18,251) | (18,251) |  |  |  |  | (9) | (18,260) |  |  |  |  |
Noncontrolling interest adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,826 | 2,826 |  |  |  |  |
Joint venture partner distribution declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34,751) | (34,751) |  |  |  |  |
Noncontrolling interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,075 | 12,075 |  |  |  |  |
Restricted stock awards (net of cancellations) |  |  | 6,797 |  |  |  |  |  |  | 6,797 |  |  |  |  |  | 6,797 |  |  |  |  |
Restricted stock awards (net of cancellations) (in shares) |  | 213 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized restricted stock |  |  | (9,063) |  |  |  |  |  |  | (9,063) |  |  |  |  |  | (9,063) |  |  |  |  |
Restricted stock amortization |  |  | 7,991 |  |  |  |  |  |  | 7,991 |  |  |  |  |  | 7,991 |  |  |  |  |
Cash dividends |  |  |  |  |  |  | (26,446) |  |  | (26,446) |  |  |  |  |  | (26,446) |  |  |  |  |
Ending balance at May. 31, 2020 |  |  | 459,668 |  |  |  | 894,619 |  | (63,066) | 1,291,221 |  |  |  |  | 176,886 | 1,468,107 |  |  |  |  |
Ending Balance (in shares) at May. 31, 2020 |  | 32,701 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at May. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,611
Net earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (953)
Beginning balance at Feb. 29, 2020 |  |  | 458,908 |  |  |  | 875,885 |  | (48,321) | 1,286,472 |  |  |  |  | 201,410 | 1,487,882 |  |  |  |  |
Beginning balance (in shares) at Feb. 29, 2020 |  | 32,642 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Feb. 29, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,782
Net earnings (loss) | 35,869 |  |  |  |  |  | 27,772 |  |  | 27,772 |  |  |  |  | 8,268 | 36,040 |  |  |  |  |
Other comprehensive income (loss), net | (14,746) |  |  |  |  |  |  |  | (14,745) | (14,745) |  |  |  |  | (1) | (14,746) |  |  |  |  |
Noncontrolling interest adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,212) | (6,212) |  |  |  |  |
Joint venture partner distribution declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26,579) | (26,579) |  |  |  |  |
Restricted stock awards (net of cancellations) |  |  | (4,317) |  |  |  |  |  |  | (4,317) |  |  |  |  |  | (4,317) |  |  |  |  |
Restricted stock awards (net of cancellations) (in shares) |  | 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized restricted stock |  |  | 3,945 |  |  |  |  |  |  | 3,945 |  |  |  |  |  | 3,945 |  |  |  |  |
Restricted stock amortization |  |  | 1,132 |  |  |  |  |  |  | 1,132 |  |  |  |  |  | 1,132 |  |  |  |  |
Cash dividends |  |  |  |  |  |  | (9,038) |  |  | (9,038) |  |  |  |  |  | (9,038) |  |  |  |  |
Ending balance at May. 31, 2020 |  |  | 459,668 |  |  |  | 894,619 |  | (63,066) | 1,291,221 |  |  |  |  | 176,886 | 1,468,107 |  |  |  |  |
Ending Balance (in shares) at May. 31, 2020 |  | 32,701 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at May. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,611
Net earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (171)
Beginning balance at Aug. 31, 2020 | $ 1,473,055 |  | 460,400 |  |  |  | $ 885,460 | $ (509) | (52,817) | $ 1,293,043 |  |  |  | $ (509) | 180,012 | $ 1,473,055 |  |  |  | $ (509) |
Beginning balance (in shares) at Aug. 31, 2020 | 32,701 | 32,701 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Aug. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,117
Accounting Standards Update [Extensible List] |  |  |  |  |  |  | ASU 2016-13 |  |  | ASU 2016-13 |  |  |  |  |  | ASU 2016-13 |  |  |  |  |
Net earnings (loss) | $ (515) |  |  |  |  |  | $ 700 |  |  | $ 700 |  |  |  |  | (421) | $ 279 |  |  |  |  | (794)
Other comprehensive income (loss), net | 12,828 |  |  |  |  |  |  |  | 12,827 | 12,827 |  |  |  |  | 1 | 12,828 |  |  |  |  |
Noncontrolling interest adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 343 | 343 |  |  |  |  |
Joint venture partner distribution declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,980) | (22,980) |  |  |  |  |
Investment by joint venture partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 | 7,000 |  |  |  |  |
Restricted stock awards (net of cancellations) |  |  | 15,053 |  |  |  |  |  |  | 15,053 |  |  |  |  |  | 15,053 |  |  |  |  |
Restricted stock awards (net of cancellations) (in shares) |  | 145 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized restricted stock |  |  | (17,854) |  |  |  |  |  |  | (17,854) |  |  |  |  |  | (17,854) |  |  |  |  |
Restricted stock amortization |  |  | 12,468 |  |  |  |  |  |  | 12,468 |  |  |  |  |  | 12,468 |  |  |  |  |
Repurchase of stock |  |  | (20,000) |  |  |  |  |  |  | (20,000) |  |  |  |  |  | (20,000) |  |  |  |  |
Repurchase of stock (in shares) |  | (469) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, due 2028 - equity component, net of tax |  |  |  | $ 56,253 |  |  |  |  |  |  | $ 56,253 |  |  |  |  |  | $ 56,253 |  |  |  |
Convertible senior notes, due 2028 issuance costs - equity component, net of tax |  |  |  | (1,801) |  |  |  |  |  |  | (1,801) |  |  |  |  |  | (1,801) |  |  |  |
Convertible senior notes, due 2024 - equity component extinguishment, net of tax |  |  |  |  | $ (28,499) | $ (8,214) |  |  |  |  |  | $ (28,499) | $ (8,214) |  |  |  |  | $ (28,499) | $ (8,214) |  |
Cash dividends |  |  |  |  |  |  | (26,704) |  |  | (26,704) |  |  |  |  |  | (26,704) |  |  |  |  |
Ending balance at May. 31, 2021 | $ 1,450,718 |  | 467,806 |  |  |  | 858,947 |  | (39,990) | 1,286,763 |  |  |  |  | 163,955 | 1,450,718 |  |  |  |  |
Ending Balance (in shares) at May. 31, 2021 | 32,377 | 32,377 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at May. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,323
Beginning balance at Feb. 28, 2021 |  |  | 466,994 |  |  |  | 848,192 |  | (46,684) | 1,268,502 |  |  |  |  | 175,857 | 1,444,359 |  |  |  |  |
Beginning balance (in shares) at Feb. 28, 2021 |  | 32,825 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Feb. 28, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,037
Net earnings (loss) | $ 20,035 |  |  |  |  |  | 19,737 |  |  | 19,737 |  |  |  |  | 12 | 19,749 |  |  |  |  | 286
Other comprehensive income (loss), net | 6,691 |  |  |  |  |  |  |  | 6,694 | 6,694 |  |  |  |  | (3) | 6,691 |  |  |  |  |
Noncontrolling interest adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,628 | 1,628 |  |  |  |  |
Joint venture partner distribution declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,539) | (20,539) |  |  |  |  |
Investment by joint venture partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 | 7,000 |  |  |  |  |
Restricted stock awards (net of cancellations) |  |  | (444) |  |  |  |  |  |  | (444) |  |  |  |  |  | (444) |  |  |  |  |
Restricted stock awards (net of cancellations) (in shares) |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock amortization |  |  | 3,517 |  |  |  |  |  |  | 3,517 |  |  |  |  |  | 3,517 |  |  |  |  |
Repurchase of stock |  |  | (20,000) |  |  |  |  |  |  | (20,000) |  |  |  |  |  | (20,000) |  |  |  |  |
Repurchase of stock (in shares) |  | (469) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, due 2028 - equity component, net of tax |  |  |  | 56,253 |  |  |  |  |  |  | 56,253 |  |  |  |  |  | 56,253 |  |  |  |
Convertible senior notes, due 2028 issuance costs - equity component, net of tax |  |  |  | $ (1,801) |  |  |  |  |  |  | $ (1,801) |  |  |  |  |  | $ (1,801) |  |  |  |
Convertible senior notes, due 2024 - equity component extinguishment, net of tax |  |  |  |  | $ (28,499) | $ (8,214) |  |  |  |  |  | $ (28,499) | $ (8,214) |  |  |  |  | $ (28,499) | $ (8,214) |  |
Cash dividends |  |  |  |  |  |  | (8,982) |  |  | (8,982) |  |  |  |  |  | (8,982) |  |  |  |  |
Ending balance at May. 31, 2021 | $ 1,450,718 |  | $ 467,806 |  |  |  | $ 858,947 |  | $ (39,990) | $ 1,286,763 |  |  |  |  | $ 163,955 | $ 1,450,718 |  |  |  |  |
Ending Balance (in shares) at May. 31, 2021 | 32,377 | 32,377 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at May. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,323

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