RESTRUCTURING CHARGES AND SEVERANCE CHARGES - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended									6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013 Scottsdale Facility	Sep. 30, 2012 Scottsdale Facility	Apr. 03, 2011 Scottsdale Facility sqft	Mar. 31, 2013 Scottsdale Facility Employee Severance	Sep. 30, 2012 Scottsdale Facility Employee Severance	Mar. 31, 2013 Other Facilities	Sep. 30, 2012 Other Facilities	Mar. 31, 2013 Other Facilities Employee Severance Person	Sep. 30, 2012 Other Facilities Employee Severance	Mar. 31, 2013 Other Facilities Contract Termination Costs	Sep. 30, 2012 Other Facilities Contract Termination Costs
Schedule of Status of Facilities by Location [Line Items]
Occupied leased facility (square foot)							135,000
Recorded severance accruals					$ 5,069	$ 5,965		$ 0	$ 117	$ 3,959	$ 2,314	$ 3,875	$ 2,124	$ 84	$ 190
Restructuring and severance charges	$ 6,261	$ 119	$ 7,111	$ 7,344								$ 7,200
Number of employees												120