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Fair Value Measurements Level 3 Activity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper $ 139,485
Total 215,726
Money Market Funds
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper 35,309
Commercial Paper
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper 40,932
Commercial paper 36,648
Corporate Debt Securities
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper 100,814
US Government Agencies Debt Securities
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper 2,023
Fair Value, Inputs, Level 1
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Total 35,309
Fair Value, Inputs, Level 1 | Money Market Funds
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper 35,309
Fair Value, Inputs, Level 2
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Total 180,417
Fair Value, Inputs, Level 2 | Commercial Paper
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper 40,932
Commercial paper 36,648
Fair Value, Inputs, Level 2 | Corporate Debt Securities
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper 100,814
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities
 
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Commercial paper $ 2,023