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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Accumulated Other Comprehensive Income | Retained Earnings | Noncontrolling Interest | Unvested restricted stock units | Unvested restricted stock units Common Stock
--- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Sep. 30, 2015 |  | 65,437 |  |  |  |  |
Balance at Sep. 30, 2015 | $ 615,699 | $ 446,132 | $ (22,365) | $ 188,611 | $ 3,321 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Net income | 180,160 |  |  | 178,362 | 1,798 |  |
Foreign currency translation | (13,828) |  | (13,828) |  |  |  |
Interest rate hedge, net of income taxes | 24 |  | 24 |  |  |  |
Cash dividends | (12,761) |  |  | (11,701) | (1,060) |  |
Dividends on RSUs |  | $ 363 |  | (363) |  |  |
Repurchases of common stock | $ (31,338) |  |  | (31,338) |  |  |
Repurchases of common stock (in shares) | (600) | (587) |  |  |  |  |
Stock compensation expense | $ 18,751 | $ 18,751 |  |  |  |  |
Stock compensation tax benefit | 5,172 | 5,172 |  |  |  |  |
Tax withholding relating to RSU vesting |  |  |  |  |  | $ (9,285) | $ (9,285)
Stock options exercised and RSUs vesting | 546 | $ 546 |  |  |  |  |
Stock options exercised and RSUs vesting (in shares) |  | 373 |  |  |  |  |
Balance (in shares) at Sep. 30, 2016 |  | 65,223 |  |  |  |  |
Balance at Sep. 30, 2016 | 753,140 | $ 461,679 | (36,169) | 323,571 | 4,059 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Net income | 212,182 |  |  | 209,426 | 2,756 |  |
Foreign currency translation | 8,549 |  | 8,549 |  |  |  |
Interest rate hedge, net of income taxes | 1 |  | 1 |  |  |  |
Cash dividends | (12,806) |  |  | (11,674) | (1,132) |  |
Dividends on RSUs |  | $ 348 |  | (348) |  |  |
Repurchases of common stock | $ (28,863) |  |  | (28,863) |  |  |
Repurchases of common stock (in shares) | (600) | (558) |  |  |  |  |
Stock compensation expense | $ 21,365 | $ 21,365 |  |  |  |  |
Tax withholding relating to RSU vesting |  |  |  |  |  | (8,724) | (8,724)
Stock options exercised and RSUs vesting | $ 924 | $ 924 |  |  |  |  |
Stock options exercised and RSUs vesting (in shares) |  | 472 |  |  |  |  |
Balance (in shares) at Sep. 30, 2017 | 65,137 | 65,137 |  |  |  |  |
Balance at Sep. 30, 2017 | $ 945,768 | $ 475,592 | (27,619) | 492,112 | 5,683 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Net income | 220,816 |  |  | 220,751 | 65 |  |
Foreign currency translation | (9,334) |  | (9,334) |  |  |  |
Interest rate hedge, net of income taxes | 0 |  |  |  |  |  |
Cash dividends | (14,607) |  |  | (11,692) | (2,915) |  |
Dividends on RSUs | 0 | $ 318 |  | (318) |  |  |
Repurchases of common stock | $ (67,572) |  |  | (67,572) |  |  |
Repurchases of common stock (in shares) | (1,100) | (1,088) |  |  |  |  |
Stock compensation expense | $ 20,238 | $ 20,238 |  |  |  |  |
Tax withholding relating to RSU vesting |  |  |  |  |  | $ (8,733) | $ (8,733)
Stock options exercised and RSUs vesting | 0 | $ 0 |  |  |  |  |
Stock options exercised and RSUs vesting (in shares) |  | 322 |  |  |  |  |
Addition of noncontrolling interest from acquisition | $ (157) | $ 124 |  |  | (281) |  |
Balance (in shares) at Sep. 30, 2018 | 64,371 | 64,371 |  |  |  |  |
Balance at Sep. 30, 2018 | $ 1,086,419 | $ 487,539 | $ (36,953) | $ 633,281 | $ 2,552 |  |

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