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Expense Example (Small Cap Index Trust, USD $)
12 Months Ended
May 01, 2011
Series I, Small Cap Index Trust
 
Expense Example:  
Year 1 $ 64
Year 3 202
Year 5 351
Year 10 786
Series II, Small Cap Index Trust
 
Expense Example:  
Year 1 85
Year 3 265
Year 5 460
Year 10 1,025
Series NAV, Small Cap Index Trust
 
Expense Example:  
Year 1 59
Year 3 186
Year 5 324
Year 10 $ 726