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Earnings per Share and Dividends per Share	6 Months Ended
Earnings per Share and Dividends per Share	Mar. 31, 2016
Text Block [Abstract]
Earnings per Share and Dividends per Share	(6) Earnings per Share and Dividends per Share Basic earnings per share is determined by dividing net earnings by the weighted average number of shares of common stock outstanding, while diluted earnings per share is determined by dividing net earnings by the weighted average number of shares of common stock outstanding adjusted for the dilutive effect of common stock equivalents. All common stock equivalents were dilutive and therefore included in the diluted earnings per share calculation for the three and six months ended March 31, 2016. Quarterly cash dividends of $0.06 and $0.08 per share, respectively, were paid on December 9, 2015, to shareholders of record as of November 16, 2015, and on March 7, 2016, to shareholders of record as of February 12, 2016.