Interest Rate Swap Agreement Amount of Gain (Loss) and Reclassification (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Interest Rate Swaps [Line Items]
Interest Expense	$ 610		$ 1,282
Gains (Losses) on Effective Cash Flow Hedge
Interest Rate Swaps [Line Items]
Net current period other comprehensive income (loss)	199
Interest Rate Swap | Gains (Losses) on Effective Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Loss
Interest Rate Swaps [Line Items]
Interest Expense	$ (86)	[1]

[1] amounts in parenthesis represent a decrease to income