v3.26.1
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended 60 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
May 31, 2016
May 31, 2026
May 31, 2017
May 31, 2018
May 31, 2019
May 31, 2020
May 31, 2021
May 31, 2022
May 31, 2023
May 31, 2024
May 31, 2025
May 31, 2026
C000021763 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Asset Allocation Fund                    
Accumulated Value $ 10,000   $ 10,835 $ 11,800 $ 11,396 $ 11,241 $ 14,861 $ 14,391 $ 14,548 $ 17,160 $ 18,583 $ 21,389
C000021764 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   International Equities Index Fund                    
Accumulated Value 10,000   11,598 12,482 11,757 11,355 15,729 13,993 14,400 17,023 19,120 23,404
C000021765 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   International Government Bond Fund                    
Accumulated Value 10,000   10,245 10,278 10,613 11,075 11,813 10,186 9,725 9,929 10,528 11,029
C000021766 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   International Growth Fund                    
Accumulated Value 10,000   11,381 13,472 13,449 14,793 22,803 16,389 17,880 18,650 22,088 22,882
C000021768 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Large Cap Core Fund                    
Accumulated Value 10,000   11,650 13,515 15,204.00 17,801 24,622 24,185 24,959 30,638 32,643 39,266
C000021769 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Mid Cap Index Fund                    
Accumulated Value 10,000   11,694 13,391 12,620 12,462 19,490 18,156 17,607 22,093 22,446 28,174
C000021770 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Mid Cap Strategic Growth Fund                    
Accumulated Value 10,000   11,843 14,113 15,165 17,101 25,254 21,628 22,469 27,989 31,723 37,751
C000021772 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Nasdaq-100® Index Fund                    
Accumulated Value 10,000   12,888 15,588 16,017 21,577 30,958 28,660 32,424 42,325 48,849 69,605
C000021773 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Science & Technology Fund                    
Accumulated Value 10,000   13,182 17,148 17,669 23,075 34,194 26,167 29,285 39,998 46,479 74,605
C000021774 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Systematic Growth Fund                    
Accumulated Value 10,000   12,349 15,792 16,458 20,041 26,793 20,973 22,078 30,079 34,679 43,858
C000021776 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Small Cap Index Fund                    
Accumulated Value 10,000   12,018 14,472 13,135 12,628 20,708 17,159 16,283 19,486 19,629 27,993
C000021777 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   International Socially Responsible Fund                    
Accumulated Value 10,000   11,515 12,915 12,989 12,723 17,643 15,637 16,102 18,932 21,055 25,587
C000021778 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Stock Index Fund                    
Accumulated Value 10,000   11,708 13,346 13,803 15,523 21,725 21,604 22,162 28,300 32,026 41,466
C000021782 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Government Securities Fund                    
Accumulated Value 10,000   10,035 9,902 10,494 11,393 11,199 10,363 10,163 10,229 10,733 11,187
C000021783 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Systematic Core Fund                    
Accumulated Value 10,000   11,722 13,149 13,526 15,565 22,370 21,632 21,791 27,796 31,042 38,109
C000021785 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Dividend Value Fund                    
Accumulated Value 10,000   11,651 12,599 12,577 12,536 17,371 17,753 17,133 20,674 22,690 27,657
C000021786 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Inflation Protected Fund                    
Accumulated Value 10,000   10,320 10,434 10,801 11,328 12,205 12,043 11,807 11,970 12,390 13,109
C000022843 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Systematic Value Fund                    
Accumulated Value 10,000   11,725 12,938 12,699 12,402 16,978 17,579 16,895 20,755 23,343 29,302
C000022844 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   International Value Fund                    
Accumulated Value 10,000   12,236 12,626 10,880 9,774 14,641 12,868 12,707 15,616 18,246 23,437
C000022845 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Emerging Economies Fund                    
Accumulated Value 10,000   13,041 14,802 13,063 12,575 19,033 15,216 13,471 15,818 17,664 27,220
C000022846 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Global Strategy Fund                    
Accumulated Value 10,000   11,416 11,955 11,335 11,220 13,407 12,124 11,877 14,226 15,603 19,697
C000022849 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Small Cap Core Fund                    
Accumulated Value 10,000   11,765 13,576 12,642 11,254 18,806 17,832 16,467 20,824 19,230 22,659
C000022851 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Growth Fund                    
Accumulated Value 10,000   12,048 14,530 14,915 19,006 25,958 22,110 23,743 32,219 37,300 48,025
C000059956 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Global Real Estate Fund                    
Accumulated Value 10,000   10,498 11,148 12,051 10,801 13,874 13,089 11,001 11,940 13,119 14,608
C000121199 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Dynamic Allocation Fund                    
Accumulated Value 10,000   11,198 12,256 12,436 13,733 16,262 15,078 14,749 17,057 18,459 21,527
C000222575 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Aggressive Allocation Lifestyle Fund                    
Accumulated Value 10,000   11,278 12,486 12,238 12,658 17,482 16,149 16,083 19,194 21,218 25,797
C000222576 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   U.S. Socially Responsible Fund                    
Accumulated Value 10,000   11,576 13,172 13,681 15,286 21,210 20,594 20,813 26,704 29,688 37,069
C000222577 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Capital Appreciation Fund                    
Accumulated Value 10,000   11,395 13,530 13,941 16,256 22,966 21,502 22,792 30,942 35,468 44,408
C000222578 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Conservative Allocation Lifestyle Fund                    
Accumulated Value 10,000   10,774 11,291 11,430 11,930 14,536 13,391 13,217 14,594 15,722 17,778
C000222579 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Core Bond Fund                    
Accumulated Value 10,000   10,264 10,217 10,811 11,744 12,081 11,024 10,695 10,994 11,607 12,254
C000222580 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   High Yield Bond Fund                    
Accumulated Value 10,000   11,161 11,408 11,927 12,096 13,892 13,150 13,192 14,505 15,725 17,066
C000222581 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   International Opportunities Fund                    
Accumulated Value 10,000   11,642 14,054 12,434 12,843 17,394 14,321 13,366 15,407 17,078 20,287
C000222582 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Mid Cap Value Fund                    
Accumulated Value 10,000   11,354 12,618 11,855 11,169 17,518 17,558 16,703 20,723 21,409 25,751
C000222583 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Moderate Allocation Lifestyle Fund                    
Accumulated Value 10,000   11,048 12,022 11,997 12,526 16,399 15,335 15,229 17,486 19,084 22,404
C000222584 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Small Cap Value Fund                    
Accumulated Value 10,000   11,735 13,547 11,483 9,738 17,607 16,640 14,888 18,151 17,647 25,083
C000224903 [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Small Cap Growth Fund                    
Accumulated Value 10,000   13,051 18,169 17,904 21,716 32,622 22,864 22,426 25,759 26,380 33,237
Bloomberg Global Aggregate Index USD hedged [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Global Aggregate Index (USD hedged)                    
Accumulated Value 10,000   10,176.7 10,296.99 10,966.67 11,736.5 11,746.92 10,914.61 10,810.94 11,161.59 11,837.87 12,284.39
Russell 3000 Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell 3000® Index                    
Accumulated Value 10,000   11,769.11 13,541.71 13,879.74 15,470.85 22,264.35 21,444.15 21,880.47 27,915.77 31,577.84 40,876.03
Standard & Poor's 500 Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   S&P 500® Index                    
Accumulated Value 10,000   11,746.84 13,436.5 13,944.78 15,734.95 22,079.03 22,012.91 22,656.07 29,042.05 32,969.41 42,788.18
MSCI EAFE Index net [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI EAFE Index (net)                    
Accumulated Value 10,000   11,643.64 12,571.91 11,849.51 11,516.15 15,939.99 14,285.5 14,722.76 17,450.36 19,776.36 24,285.29
Russell 1000 Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell 1000® Index                    
Accumulated Value 10,000   11,747.68 13,462.35 13,929.06 15,675.44 22,362.85 21,757.32 22,289.86 28,532.63 32,451.02 41,811.94
MSCI ACWI ex USA Index net [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI ACWI ex USA Index (net)                    
Accumulated Value 10,000   11,824.26 12,967.92 12,156.15 11,738.76 16,760.17 14,680.77 14,474.5 16,897.99 19,221.62 25,520.55
MSCI ACWI Index net [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI ACWI Index (net)                    
Accumulated Value 10,000   11,752.94 13,144.07 12,974.09 13,678.59 19,402.44 18,086.52 18,240.34 22,537.12 25,613.88 33,367.01
Bloomberg U S Aggregate Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg U.S. Aggregate Bond Index                    
Accumulated Value 10,000   10,157.85 10,119.8 10,767.5 11,781.32 11,733.59 10,768.85 10,538.11 10,675.67 11,258.49 11,836.44
Bloomberg U S Universal Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg U.S. Universal Index                    
Accumulated Value 10,000   10,277.5 10,255.4 10,913.02 11,841.09 11,985.84 10,977.39 10,770.43 11,026.34 11,670.18 12,311.65
Sixty S And P 500 Index 40 Bloomberg U S Aggregate Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   60% S&P 500® Index; 40% Bloomberg U.S. Aggregate Bond Index                    
Accumulated Value 10,000   11,092.15 12,018.89 12,648.62 14,178.36 17,401.08 16,820.27 17,016.62 19,888.19 21,956.97 26,245.98
Seventy FTSE WGBI Index unhedged 30 JPMorgan EMBI Global Diversified Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   70% FTSE WGBI Index (unhedged); 30% JPMorgan EMBI Global Diversified Index                    
Accumulated Value 10,000   10,253.26 10,384.94 10,821.72 11,341.34 11,890.85 10,101.61 9,667.39 9,933.63 10,625.39 11,237.4
S And P MidCap 400 Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   S&P MidCap 400® Index                    
Accumulated Value 10,000   11,716.21 13,456.87 12,725.21 12,621.97 19,787.15 18,497.12 18,011.33 22,688.63 23,181.47 29,179.67
Russell Midcap Growth Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell Midcap® Growth Index                    
Accumulated Value 10,000   11,668.25 13,817.04 14,766.85 17,281.30 23,809.95 19,354.59 20,468.18 24,952.43 30,750.09 33,172.98
Nasdaq 100 Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Nasdaq-100® Index                    
Accumulated Value 10,000   12,949.11 15,752.5 16,289.56 22,063.84 31,840.98 29,624.34 33,704.82 44,192.78 51,272.09 73,360.86
S And P North American Technology Sector Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   S&P North American Technology Sector Index                    
Accumulated Value 10,000   13,314.73 17,491.48 18,386.52 24,472.64 35,390.45 31,007.35 35,414.41 49,938.06 58,177.81 96,713.75
Russell 1000 Growth Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell 1000® Growth Index                    
Accumulated Value 10,000   12,026.7 14,555.14 15,340.2 19,367.39 27,099.62 25,405.5 27,830.92 37,182.51 43,734.72 56,267.46
Russell 2000 Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell 2000® Index                    
Accumulated Value 10,000   12,036.14 14,535.4 13,220.68 12,766.04 21,008.38 17,454.79 16,638.01 19,984.75 20,221.66 28,933.83
Bloomberg U S Government Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg U.S. Government Bond Index                    
Accumulated Value 10,000   10,006.9 9,926.86 10,547.81 11,733.63 11,310.49 10,468.28 10,237.18 10,222.44 10,738.65 11,137.26
Russell 1000 Value Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell 1000® Value Index                    
Accumulated Value 10,000   11,465.54 12,411.14 12,590.90 12,384.51 17,881.15 18,047.77 17,227.26 20,967.58 22,835.7 29,355.06
Bloomberg U S TIPS Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg U.S. TIPS Index                    
Accumulated Value 10,000   10,240.91 10,316.7 10,766.8 11,628.42 12,448.78 12,268.76 11,753.98 11,937.65 12,613.92 13,232.47
MSCI EAFE Value Index net [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI EAFE Value Index (net)                    
Accumulated Value 10,000   11,844.27 12,544.43 11,512.13 10,012.64 14,170.23 13,537.86 13,549.08 16,744.03 19,878.74 25,856.00
MSCI Emerging Markets Index net [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI Emerging Markets Index (net)                    
Accumulated Value 10,000   12,740.85 14,528.24 13,264.9 12,683 19,151.59 15,354.07 14,051.04 15,791.71 17,850.47 27,544.83
Sixty MSCI ACWI Index net 40 Bloomberg Global Aggregate Index USD hedged [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   60% MSCI ACWI Index (net); 40% Bloomberg Global Aggregate Index (USD hedged)                    
Accumulated Value 10,000   11,101.42 11,940.34 12,188.21 12,995.64 16,085.64 15,000.1 15,057.81 17,343.83 19,191.05 22,874.39
Russell 2000 Value Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell 2000® Value Index                    
Accumulated Value 10,000   12,100.35 14,078.9 12,485.73 10,651.45 19,106.96 17,642.14 15,614.15 19,011.31 18,795.43 27,132.43
FTSE EPRA NAREIT Developed Index net [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE EPRA /NAREIT Developed Index (net)                    
Accumulated Value 10,000   10,306.27 10,814.67 11,629.1 9,643.41 13,107.52 12,523.88 10,596.46 11,370.79 12,574.9 14,244.96
Fifty Six Russell 3000 Index 19 MSCI EAFE Index net 25 Bloomberg U S Aggregate Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   56% Russell 3000® Index; 19% MSCI EAFE Index (net); 25% Bloomberg U.S. Aggregate Bond Index                    
Accumulated Value 10,000   11,333.86 12,441.23 12,710.84 13,811.4 18,047.72 16,971.1 17,220.64 20,481.49 22,823.8 27,828.13
Twenty Six Russell 3000 Index 9 MSCI EAFE Index net 65 Bloomberg U S Aggregate Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   26% Russell 3000® Index; 9% MSCI EAFE Index (net); 65% Bloomberg U.S. Aggregate Bond Index                    
Accumulated Value 10,000   10,695.34 11,154.03 11,668.18 12,767.11 14,461.86 13,436.32 13,394.47 14,636.82 15,849.27 17,873.09
FTSE US High Yield Market Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE US High-Yield Market Index                    
Accumulated Value 10,000   11,349.51 11,631.02 12,222.23 12,261.59 14,125.13 13,445.7 13,444.88 14,962.2 16,395.08 17,614.55
MSCI ACWI ex USA SMID Cap Index net [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI ACWI ex USA SMID Cap Index (net)                    
Accumulated Value 10,000   11,634.68 13,126.55 11,694.71 11,305.52 16,657.24 14,317.89 13,801.99 15,939.25 18,155.24 23,554.16
Russell Midcap Value Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell Midcap® Value Index                    
Accumulated Value 10,000   11,526.67 12,486.13 12,224.6 11,380.29 17,823.07 17,813.02 16,121.69 19,937.39 21,138.95 26,891.89
Forty One Russell 3000 Index 14 MSCI EAFE Index net 45 Bloomberg U S Aggregate Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   41% Russell 3000® Index; 14% MSCI EAFE Index (net); 45% Bloomberg U.S. Aggregate Bond Index                    
Accumulated Value 10,000   11,011.38 11,783.48 12,189.31 13,304.34 16,195.5 15,142.27 15,236.38 17,374.63 19,089.58 22,390.56
Russell 2000 Growth Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Russell 2000® Growth Index                    
Accumulated Value $ 10,000   $ 11,970.93 $ 14,972.99 $ 13,942.32 $ 14,963.48 $ 22,465.48 $ 16,689.63 $ 17,136.99 $ 20,287.25 $ 20,987.74 $ 29,775.08