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Stockholders' Equity (Summary of Activity for Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, beginning balance 10 10
Weighted-Average Grant Date Fair Value Per Share, beginning balance $ 82.71 $ 82.71
Shares granted, Number of Shares
Shares vested, Number of Shares
Shares forfeited, Number of Shares
Number of shares, ending balance 10 10
Weighted-Average Grant Date Fair Value Per Share, ending balance $ 82.71 $ 82.71