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Cash and Cash Equivalents and Investments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2013
Mar. 31, 2013
Total [Member] | Cash [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities $ 27,860 $ 28,715
Total [Member] | Certificates of deposit [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 23,209 21,222
Total [Member] | Municipal bonds [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 3,684  
Level 1 [Member] | Cash [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 27,860 28,715
Level 1 [Member] | Certificates of deposit [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 0 0
Level 2 [Member] | Certificates of deposit [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 23,209 21,222
Level 2 [Member] | Municipal bonds [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 3,684  
Level 3 [Member] | Cash [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 0 0
Level 3 [Member] | Certificates of deposit [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities 0 0
Level 3 [Member] | Municipal bonds [Member]
   
Assets:    
Cash/Certificates of deposit/Money market securities $ 0