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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands | Total | Common Stock | Paid in Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2014 |  | 27,173 |  |  |
Beginning balance at Sep. 30, 2014 | $ 279,118,000 | $ 27,000 | $ 851,624,000 | $ (571,257,000) | $ (1,276,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 344,094,000 |  |  | 344,094,000 |
Change in unrealized loss related to available-for-sale securities | 1,276,000 |  |  |  | 1,276,000
Total comprehensive income | 345,370,000 |  |  |  |
Conversion of TEU (debt to stock conversion) (in shares) |  | 5,222 |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments | 1,000 | $ 5,000 | (4,000) |  |
Amortization of nonvested stock awards | 6,135,000 |  | 6,135,000 |  |
Exercises of stock options (in shares) |  | 1 |  |  |
Exercises of stock options | 14,000 |  | 14,000 |  |
Tax excess (deficiency) from stock transactions | (22,000) |  | (22,000) |  |
Shares issued under employee stock plans, net (in shares) |  | 410 |  |  |
Shares issued under employee stock plans, net | 0 |  | 0 |  |
Forfeiture of restricted stock (in shares) |  | (135) |  |  |
Forfeiture of restricted stock | 0 |  |  |  |
Common stock redeemed (in shares) |  | (10) |  |  |
Common stock redeemed | (192,000) |  | (192,000) |  |
Other activity | (1,000) | $ 1,000 | (2,000) |  |
Ending balance (in shares) at Sep. 30, 2015 |  | 32,661 |  |  |
Ending balance at Sep. 30, 2015 | 630,423,000 | $ 33,000 | 857,553,000 | (227,163,000) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 4,693,000 |  |  | 4,693,000 |
Change in unrealized loss related to available-for-sale securities | 0 |  |  |  |
Total comprehensive income | 4,693,000 |  |  |  |
Amortization of nonvested stock awards | 7,959,000 |  | 7,959,000 |  |
Shares issued under employee stock plans, net (in shares) |  | 491 |  |  |
Shares issued under employee stock plans, net | 0 | $ 0 | 0 |  |
Forfeiture of restricted stock (in shares) |  | (64) |  |  |
Forfeiture of restricted stock | 0 |  |  |  |
Common stock redeemed (in shares) |  | (17) |  |  |
Common stock redeemed | (222,000) |  | (222,000) |  |
Ending balance (in shares) at Sep. 30, 2016 |  | 33,071 |  |  |
Ending balance at Sep. 30, 2016 | 642,853,000 | $ 33,000 | 865,290,000 | (222,470,000) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 31,813,000 |  |  | 31,813,000 |
Change in unrealized loss related to available-for-sale securities | 0 |  |  |  |
Total comprehensive income | 31,813,000 |  |  |  |
Amortization of nonvested stock awards | 8,164,000 |  | 8,164,000 |  |
Exercises of stock options (in shares) |  | 2 |  |  |
Exercises of stock options | 24,000 |  | 24,000 |  |
Shares issued under employee stock plans, net (in shares) |  | 536 |  |  |
Shares issued under employee stock plans, net | 1,000 | $ 1,000 |  |  |
Forfeiture of restricted stock (in shares) |  | (61) |  |  |
Forfeiture of restricted stock | 0 |  |  |  |
Common stock redeemed (in shares) |  | (32) |  |  |
Common stock redeemed | (415,000) |  | (415,000) |  |
Ending balance (in shares) at Sep. 30, 2017 |  | 33,516 |  |  |
Ending balance at Sep. 30, 2017 | $ 682,440,000 | $ 34,000 | $ 873,063,000 | $ (190,657,000) | $ 0

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