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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2018
Stockholders Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) consisted of the following (in thousands):
|  | Unrealized Gains (Losses) on Available-for-Sale Securities |  |  | Foreign Currency Translation Adjustments |  |  | Total |
Balance at October 1, 2015 |  | $ | (3 | ) |  | $ | (12,942 | ) |  | $ | (12,945 | )
Other comprehensive loss |  |  | (12 | ) |  |  | (2,984 | ) |  |  | (2,996 | )
Balance at September 30, 2016 |  |  | (15 | ) |  |  | (15,926 | ) |  |  | (15,941 | )
Other comprehensive income (loss) |  |  | (43 | ) |  |  | 1,754 |  |  |  | 1,711 |
Balance at September 30, 2017 |  |  | (58 | ) |  |  | (14,172 | ) |  |  | (14,230 | )
Other comprehensive loss |  |  | (24 | ) |  |  | (1,365 | ) |  |  | (1,389 | )
Balance at September 30, 2018 |  | $ | (82 | ) |  | $ | (15,537 | ) |  | $ | (15,619 | )

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