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Expense Example (Core Allocation Trust, USD $)
12 Months Ended
May 01, 2011
Series I, Core Allocation Trust
 
Expense Example:  
Year 1 $ 98
Year 3 311
Year 5 548
Year 10 1,227
Series II, Core Allocation Trust
 
Expense Example:  
Year 1 118
Year 3 374
Year 5 655
Year 10 1,457
Series NAV, Core Allocation Trust
 
Expense Example:  
Year 1 93
Year 3 296
Year 5 521
Year 10 $ 1,169