Rights Agreement - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Jul. 23, 2009 Right
Class of Warrant or Right [Line Items]
Rights granted against each share outstanding		1
Preferred Stock, par value		$ 1.00
Rights Exercisable as Units, Component Description		Unit consisting of one one-hundredth of a share (a "Fractional Share") of Series A Junior Participating Preferred Stock, par value $1.00 per share, of the Company (the "Preferred Shares"), at a purchase price of $130.00 per Fractional Share, subject to adjustment
Preferred Stock, purchase price	$ 130.00
Distribution date following public announcement	10 days
Distribution date following commencement of tender	10 days
Common stock acquisition beneficial ownership recognized percentage	15.00%
Fractional Share	0.01
Conversion ratio of common stock	$ 1
Flip - Over Event
Class of Warrant or Right [Line Items]
Percentage of assets cash flow or earning power	50.00%
Flip - In Event
Class of Warrant or Right [Line Items]
After flip- in event recognized percentage	50.00%