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Earnings Per Share Data - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Exercisable stock options, included in the diluted earnings per share calculation	344,000	339,000	344,000	330,000
Effect of dilutive stock options	65,000	73,000	69,000	58,000
Anti-dilutive exercisable stock options, not included in the diluted earnings per share calculation	0	16,000	0	7,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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