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Stockholders' Equity (Changes in Nonvested Stock Options) (Details) shares in Thousands | 3 Months Ended
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Dec. 31, 2016 $ / shares shares
Stock-Based Compensation |
Number of Options, beginning balance | 2,075
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares | $ 14.90
Options granted, Number of options | 0
Options vested, Number of options | (758)
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares | $ 15.24
Options forfeited, Number of options | (13)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares | $ 14.47
Number of Options, ending balance | 1,304
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares | $ 14.70

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