Depreciation and Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Depreciation classified as:
Cost of revenues	$ 3,222	$ 3,272
Operating expenses	88	101
Total continuing operations	3,310	3,373
Depreciation and amortization classified as discontinued operations		309
Total	$ 3,310	$ 3,682