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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock [Member] | Capital In Excess Of Par Value [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Deferred Compensation [Member] | Series of Individually Immaterial Business Acquisitions [Member] | Series of Individually Immaterial Business Acquisitions [Member] Capital In Excess Of Par Value [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in Shares) at Sep. 30, 2016 |  | 79,966,000 |  |  | 34,797,000 |  |  |  |
Balance at Sep. 30, 2016 | $ 410,947 | $ 19,992 | $ 529,980 | $ 475,760 | $ (501,866) | $ (81,241) | $ (31,678) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 14,912 |  |  | 14,912 |  |  |  |  |
Dividends | (10,325) |  |  | (10,325) |  |  |  |  |
Tax effect from exercise/vesting of equity awards, net | (13,738) |  | (97) |  | $ (13,641) |  |  |  |
Tax effect from exercise/vesting of equity awards, net (in shares) |  |  |  |  | 586,000 |  |  |  |
Amortization of deferred compensation | 3,510 |  |  |  |  |  | 3,510 |  |
Common stock issued (in Shares) |  | 3,000 |  |  |  |  |  |  |
Common stock issued | 22 |  | 22 |  |  |  |  |  |
Common stock acquired (in Shares) |  |  |  |  | 129,000 |  |  |  |
Common stock acquired | (2,201) |  |  |  | $ (2,201) |  |  |  |
Equity awards granted, net (in Shares) |  | 694,000 |  |  |  |  |  |  |
Equity awards granted, net |  | $ 174 | (174) |  |  |  |  |  |
Premium on settlement of convertible debt | (73,855) |  | (73,855) |  |  |  |  |  |
Issuance of treasury stock in settlement of convertible debt | 48,858 |  | 20,375 |  | $ 28,483 |  |  |  |
Issuance of treasury stock in settlement of convertible debt (in shares) |  |  |  |  | (1,955,000) |  |  |  |
ESOP purchase of common stock | (10,908) |  |  |  |  |  | (10,908) |  |
ESOP allocation of common stock | 2,736 |  | 2,736 |  |  |  |  |  |
Stock-based compensation | 8,090 |  | 8,090 |  |  |  |  |  |
Other comprehensive income (loss), net of taxes | 20,760 |  |  |  |  | 20,760 |  |  |
Balance (in Shares) at Sep. 30, 2017 |  | 80,663,000 |  |  | 33,557,000 |  |  |  |
Balance at Sep. 30, 2017 | 398,808 | $ 20,166 | 487,077 | 480,347 | $ (489,225) | (60,481) | (39,076) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 125,678 |  |  | 125,678 |  |  |  |  |
Dividends | (55,502) |  |  | (55,502) |  |  |  |  |
Shares withheld on employee taxes on vested equity awards (in shares) |  |  |  |  | 200,000 |  |  |  |
Shares withheld on employee taxes on vested equity awards | (4,495) |  |  |  | $ (4,495) |  |  |  |
Amortization of deferred compensation | 8,110 |  |  |  |  |  | 8,110 |  |
Common stock acquired (in Shares) |  |  |  |  | 2,089,000 |  |  |  |
Common stock acquired | (41,110) |  |  |  | $ (41,110) |  |  |  |
Equity awards granted, net (in Shares) |  | 857,000 |  |  |  |  |  |  |
Equity awards granted, net |  | $ 214 | (214) |  |  |  |  |  |
ESOP allocation of common stock | 4,756 |  | 4,756 |  |  |  |  |  |
Stock-based compensation | 10,078 |  | 10,078 |  |  |  |  | $ 1,699 | $ 1,699
Other comprehensive income (loss), net of taxes | 26,369 |  |  |  |  | 26,369 |  |  |
Balance (in Shares) at Sep. 30, 2018 |  | 81,520,000 |  |  | 35,846,000 |  |  |  |
Balance at Sep. 30, 2018 | 474,391 | $ 20,380 | 503,396 | 550,523 | $ (534,830) | (34,112) | (30,966) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 37,287 |  |  |  |  |  |  |  |
Dividends | $ (13,676) |  |  | (13,676) |  |  |  |  |
Tax effect from exercise/vesting of equity awards, net (in shares) | 37,500 |  |  |  |  |  |  |  |
Shares withheld on employee taxes on vested equity awards (in shares) | 85,847 |  |  |  | 86,000 |  |  |  |
Shares withheld on employee taxes on vested equity awards | $ (1,106) |  |  |  | $ (1,106) |  |  |  |
Amortization of deferred compensation | 2,726 |  |  |  |  |  | 2,726 |  |
Common stock acquired (in Shares) |  |  |  |  | 37,000 |  |  |  |
Common stock acquired | (372) |  |  |  | $ (372) |  |  |  |
Equity awards granted, net (in Shares) |  | 1,255,000 |  |  |  |  |  |  |
Equity awards granted, net |  | $ 314 | (314) |  |  |  |  |  |
ESOP allocation of common stock | 1,512 |  | 1,512 |  |  |  |  |  |
Stock-based compensation | 13,285 |  | 13,285 |  |  |  |  | $ 1,138 | $ 1,138
Other comprehensive income (loss), net of taxes | (31,804) |  |  |  |  | (31,804) |  |  |
Balance (in Shares) at Sep. 30, 2019 |  | 82,775,000 |  |  | 35,969,000 |  |  |  |
Balance at Sep. 30, 2019 | $ 477,763 | $ 20,694 | $ 519,017 | $ 568,516 | $ (536,308) | $ (65,916) | $ (28,240) |  |

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