CPTC Loans - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 30, 2011	Sep. 30, 2011 Tranche A loan	Sep. 26, 2014 Tranche A loan	Sep. 26, 2014 Tranche B loan	Sep. 26, 2014 J.P. Morgan Tranche A loan	Sep. 26, 2014 C P T C
CPTC Loan [Line Items]
CPTC loan facility, Varian's maximum loan commitment	$ 80,300,000			$ 115,300,000	$ 70,300,000	$ 10,000,000
Pro rata share of the Company's obligation to fund the initial distribution and subsequent advances	45.80%			69.75%
Loan facility to CPTC			165,300,000			10,000,000		175,300,000
Sale of portion of Tranche A loan commitment							45,000,000
Sale of a portion of the outstanding Tranche A loan to JP Morgan chase Bank							38,100,000
Remaining Obligation Fund Tranche A Loan							6,900,000
Short-term investment	66,176,000	62,700,000
Loan to CPTC, long-term						9,400,000
CPTC loan facility, maturity	2017-09
CPTC loan facility, interest rate margin	7.00%
CPTC loan facility, minimum interest rate during initial term	9.00%
CPTC loan facility, description of interest and principal payments	Pursuant to the loan agreement, as amended in June 2014, the CPTC Loans mature in September 2017 and bear interest at the London Interbank Offer Rate (“LIBOR”) plus 7.00% per annum with a minimum interest rate of 9.00% per annum.
CPTC loan facility, amortization period over which monthly payments are calculated after January 1, 2015	15 years
Accounts receivable from CPTC, includes unbilled accounts receivable	$ 20,100,000	$ 48,400,000