Restructuring Activities and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 01, 2012
Scottsdale Facility
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 6,837
Cash expenditures	(1,012)
Ending Balance	5,825
Scottsdale Facility | Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	355
Cash expenditures	(211)
Ending Balance	144
Scottsdale Facility | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	6,482
Cash expenditures	(801)
Ending Balance	5,681
Other Facilities
Restructuring Cost and Reserve [Line Items]
Beginning Balance	2,724
Assumed from acquisition	10,047
Provisions	7,344
Cash expenditures	(15,415)
Other non-cash settlement	33
Ending Balance	4,733
Other Facilities | Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	2,382
Assumed from acquisition	8,465
Provisions	6,840
Cash expenditures	(15,041)
Other non-cash settlement	28
Ending Balance	2,674
Other Facilities | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	342
Assumed from acquisition	1,582
Provisions	504
Cash expenditures	(374)
Other non-cash settlement	5
Ending Balance	$ 2,059