CPTC Loans - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended				1 Months Ended				1 Months Ended	9 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 27, 2014	Sep. 27, 2013		Sep. 30, 2011	Sep. 30, 2011 Tranche A loan	Jun. 27, 2014 Tranche A loan	Sep. 27, 2013 Tranche A loan	Jun. 27, 2014 Tranche B loan	Apr. 30, 2010 C P T C	Jun. 27, 2014 C P T C	Jun. 27, 2014 J.P.Morgan Tranche A loan	Jun. 27, 2014 Scripps Proton Therapy Center	Jun. 27, 2014 Scripps Proton Therapy Center Maximum
Variable Interest Entity [Line Items]
Value of CPTC proton therapy system agreement										$ 88,000,000
Duration of CPTC proton therapy system service agreement	10 years
Approximate value of CPTC proton therapy system service agreement	60,000,000
CPTC loan facility, Varian's maximum loan commitment		80,300,000				115,300,000	70,300,000		10,000,000
Sale Of Portion Of Tranche A Loan Commitment		45,000,000										45,000,000
Sale of a portion of the outstanding Tranche A loan to JP Morgan chase Bank												38,100,000
Remaining obligation to fund Tranche A loan												6,900,000
Loan facility to CPTC					165,300,000				10,000,000		175,300,000
Pro rata share of the Company's obligation to fund the initial distribution and subsequent advances		45.80%				69.75%
Loan to CPTC, short-term		60,777,000	62,700,000	[1]			60,800,000	62,700,000
Loan to CPTC, long-term									8,600,000
CPTC loan facility, maturity		2017-09
CPTC loan facility, interest rate margin		7.00%
CPTC loan facility, minimum interest rate		9.00%
CPTC loan facility, description of interest and principal payments		Pursuant to the agreements entered into 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
CPTC loan facility, commitment fee as a % of loan facility amount							1.50%
CPTC loan facility, exit fee as a % of principal paid											1.00%
The Company's subsidiary right to share revenues of the Scripps Proton Therapy Center (%) prior to sale of a portion of the Tranche A loan													4.00%
The Company's subsidiary right to share revenues of the Scripps Proton Therapy Center (%)													2.50%
The Company's subsidiary right to share revenues of the Scripps Proton Therapy Center (period)													35 years
Percentage of the gross revenues of the Scripps Proton Therapy Center upon repayment														1.00%
Loan repayment amount that results in reduction of revenue shares													71,000,000
Accounts receivable from CPTC, includes unbilled accounts receivable		$ 30,500,000	$ 48,400,000

[1] The condensed consolidated balance sheet as of September 27, 2013 was derived from audited financial statements as of that date, but does not include all disclosures required by accounting principles generally accepted in the United States of America.