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Variable Interest Entity - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Jun. 29, 2012
Apr. 30, 2010
C P T C
Variable Interest Entity        
Equity CPTC has raised     $ 60  
Loan facility to CPTC 165.3      
Value of CPTC proton therapy system agreement       88
Duration of CPTC proton therapy system service agreement   10 years    
Approximate value of CPTC proton therapy system service agreement   60    
CPTC loan facility, Varian's maximum loan commitment 115.3      
Pro rata share of the Company's obligation to fund the initial distribution and subsequent advances 69.75%      
Loan to CPTC 19.2   47.2  
CPTC loan facility, end of the drawdown period 2014      
CPTC loan facility, maturity     2015-09  
CPTC loan facility, interest rate margin during initial term     6.25%  
CPTC loan facility, minimum interest rate during initial term     8.25%  
CPTC loan facility, interest rate margin during extension term     7.00%  
CPTC loan facility, minimum interest rate during extension term     9.00%  
CPTC loan facility, description of interest and principal payments     The loan, which matures in September 2015, bears interest at LIBOR plus 6.25% per annum with a minimum interest rate of 8.25% per annum. The loan can be extended for two additional one-year terms at the election of CPTC during which extensions interest will accrue at 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 July 1, 2014     15 years  
CPTC loan facility, interest rate based on which monthly payments are calculated after July 1, 2014     8.25%  
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 (%)     4.00%  
The Company's subsidiary right to share revenues of the Scripps Proton Therapy Center (period)     35 years  
Accounts receivable from CPTC $ 15.2   $ 25.7