Restructuring Activities for Scottsdale Facility and the Accrued Liabilities in the Consolidated Balance Sheets (Detail) (Scottsdale Facility, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 7,683
Cash expenditures	1,718
Ending Balance	5,965
Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	355
Cash expenditures	238
Ending Balance	117
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	7,328
Cash expenditures	1,480
Ending Balance	$ 5,848