v3.25.2
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
May 31, 2022
May 31, 2021
May 31, 2020
May 31, 2019
May 31, 2018
Apr. 26, 2018
May 31, 2017
May 31, 2016
Jan. 29, 2016
May 31, 2015
C000018356                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Large Cap Fund, Class A Shares                        
Account Value $ 271,490 $ 240,418 $ 190,733 $ 192,146 $ 195,993 $ 136,682 $ 129,214 $ 127,315   $ 110,705 $ 97,587   $ 100,000
C000018358                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Large Cap Disciplined Equity Fund, Class A Shares                        
Account Value $ 300,356 265,375 204,690 202,120 201,344 141,792 132,236 132,424   117,785 101,340   100,000
C000018357                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Large Cap Index Fund, Class A Shares                        
Account Value $ 325,474 286,573 223,835 218,618 224,776 157,662 140,175 135,526   118,329 100,760   100,000
C000134335                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index Fund, Class A Shares                        
Account Value $ 333,654 294,098 229,578 223,291 224,031 159,752 141,658 136,516   119,377 101,663   100,000
C000109763                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Extended Market Index Fund, Class A Shares                        
Account Value $ 234,575 213,479 171,173 176,662 217,765 133,775 128,772 133,154   112,287 94,338   100,000
C000018361                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Small Cap Fund, Class A Shares                        
Account Value $ 193,369 186,706 150,660 161,533 178,732 109,397 117,683 127,521   109,644 95,011   100,000
C000111997                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Small Cap II Fund, Class A Shares                        
Account Value $ 203,413 202,052 164,337 172,354 193,952 113,562 119,790 128,780   107,341 93,935   100,000
C000018359                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Small/Mid Cap Equity Fund, Class A Shares                        
Account Value $ 191,935 189,591 155,978 170,277 182,052 114,522 119,048 127,437   109,374 94,672   100,000
C000198133                          
Account Value [Line Items]                          
Line Graph and Table Measure Name U.S. Equity Factor Allocation Fund, Class A Shares                        
Account Value $ 240,061 207,463 161,796 162,724 162,555 110,927 103,470 101,700 $ 100,000        
C000036888                          
Account Value [Line Items]                          
Line Graph and Table Measure Name U.S. Managed Volatility Fund, Class A Shares                        
Account Value $ 234,903 206,199 176,284 183,158 174,913 136,008 136,426 127,384   118,160 103,715   100,000
C000160603                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Global Managed Volatility Fund, Class A Shares                        
Account Value $ 234,911 199,406 172,137 173,207 166,147 134,069 135,538 131,415   122,350 107,800 $ 100,000  
C000018354                          
Account Value [Line Items]                          
Line Graph and Table Measure Name World Equity Ex-US Fund, Class A Shares                        
Account Value $ 178,980 155,749 130,104 134,779 154,088 106,724 107,802 116,346   104,253 87,398   100,000
C000054521                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Screened World Equity Ex-US Fund, Class A Shares                        
Account Value $ 208,859 182,133 154,436 158,475 178,040 119,864 119,662 128,074   113,096 91,216   100,000
C000030145                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Emerging Markets Equity Fund, Class A Shares                        
Account Value $ 171,048 153,441 129,313 135,882 156,498 101,393 106,886 119,542   106,386 87,474   100,000
C000039813                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Opportunistic Income Fund, Class A Shares                        
Account Value $ 147,228 137,523 125,267 119,936 121,112 113,088 113,340 109,088   105,541 100,929   100,000
C000018355                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Core Fixed Income Fund, Class A Shares                        
Account Value $ 120,922 114,188 112,397 114,881 125,584 124,339 112,852 105,745   105,558 102,974   100,000
C000018352                          
Account Value [Line Items]                          
Line Graph and Table Measure Name High Yield Bond Fund, Class A Shares                        
Account Value $ 171,263 156,195 139,081 140,769 145,259 118,213 122,795 116,597   112,559 97,833   100,000
C000112815                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Long Duration Fund, Class A Shares                        
Account Value $ 121,257 118,281 118,822 126,158 147,837 149,019 123,312 111,884   110,865 106,186   100,000
C000018351                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Long Duration Credit Fund, Class A Shares                        
Account Value $ 123,410 120,283 119,023 125,729 147,445 146,675 123,807 113,063   112,342 107,374   100,000
C000096276                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Ultra Short Duration Bond Fund, Class A Shares                        
Account Value $ 127,179 120,397 113,488 110,655 112,022 110,420 107,781 104,524   102,781 101,008   100,000
C000018353                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Emerging Markets Debt Fund, Class A Shares                        
Account Value $ 132,466 120,429 108,742 107,436 127,367 113,676 113,364 111,544   110,199 98,229   100,000
C000036889                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Real Return Fund, Class A Shares                        
Account Value $ 130,721 122,093 117,116 119,618 117,201 109,323 105,683 102,776   102,287 100,521   100,000
C000144225                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Limited Duration Bond Fund, Class A Shares                        
Account Value $ 123,523 116,277 111,309 110,387 113,575 111,463 107,029 103,321   102,492 101,263   100,000
C000150792                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Intermediate Duration Credit Fund, Class A Shares                        
Account Value $ 127,367 120,678 116,445 118,483 131,002 128,059 115,378 107,830   107,681 104,162   100,000
C000081914                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Dynamic Asset Allocation Fund, Class A Shares                        
Account Value $ 324,011 279,727 221,396 221,894 215,421 148,349 132,630 131,649   118,789 99,678   100,000
C000102014                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Real Return Fund, Class A Shares                        
Account Value $ 130,615 125,392 116,891 124,409 107,437 94,103 97,399 97,366   95,979 96,806   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 249,524 219,800 171,469 166,601 167,102 119,088 105,539 101,692 100,000        
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
MSCI ACWI ex USA Index (NR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI ex USA Index (NR) (USD)                        
Account Value $ 207,318 182,256 156,117 158,342 180,770 126,611 131,112 139,868   127,533 107,857 100,000  
MSCI ACWI ex USA Index (NR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI ex USA Index (NR) (USD)                        
Account Value $ 170,319 149,729 128,255 130,083 148,508 104,015 107,713 114,906   104,772 88,608   100,000
MSCI ACWI ex USA Index (NR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI ex USA Index (NR) (USD)                        
Account Value $ 170,319 149,729 128,255 130,083 148,508 104,015 107,713 114,906   104,772 88,608   100,000
MSCI ACWI ex USA Index (NR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI ex USA Index (NR) (USD)                        
Account Value $ 170,319 149,729 128,255 130,083 148,508 104,015 107,713 114,906   104,772 88,608   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg Global Aggregate Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg Global Aggregate Index (USD)                        
Account Value $ 109,779 102,564 101,777 106,549 122,769 117,519 111,293 107,957   106,129 105,320   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
S&P 500 Index (TR)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index (TR)                        
Account Value $ 335,352 295,404 230,448 223,907 224,579 160,050 141,841 136,671   119,484 101,716   100,000
Bloomberg U.S. Aggregate Bond Index (TR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index (TR) (USD)                        
Account Value $ 115,957 109,954 108,537 110,914 120,850 121,342 110,900 104,229   104,621 102,995   100,000
Russell 1000 Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 1000 Index (USD)                        
Account Value $ 327,027 287,539 224,627 219,261 225,363 157,970 140,371 135,668   118,388 100,776   100,000
Russell 1000 Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 1000 Index (USD)                        
Account Value $ 327,027 287,539 224,627 219,261 225,363 157,970 140,371 135,668   118,388 100,776   100,000
Russell Small Cap Completeness Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell Small Cap Completeness Index (USD)                        
Account Value $ 233,721 212,290 170,521 176,006 217,126 133,351 128,435 132,983   112,194 94,235   100,000
Russell 2000 Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 2000 Index (USD)                        
Account Value $ 190,139 187,911 156,443 164,123 197,536 120,036 124,310 136,672   113,172 94,027   100,000
Russell 2000 Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 2000 Index (USD)                        
Account Value $ 190,139 187,911 156,443 164,123 197,536 120,036 124,310 136,672   113,172 94,027   100,000
Russell 2500 Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 2500 Index (USD)                        
Account Value $ 212,386 205,232 168,633 178,138 201,558 125,619 126,634 132,307   111,848 95,700   100,000
Russell 3000 Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 3000 Index (USD)                        
Account Value $ 238,046 210,440 164,944 161,654 167,837 116,625 104,631 102,083 $ 100,000        
Russell 3000 Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 3000 Index (USD)                        
Account Value $ 316,484 279,781 219,293 214,920 223,141 155,054 139,107 135,720   117,954 100,223   100,000
MSCI USA Minimum Volatility (NR) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI USA Minimum Volatility (NR) (USD)                        
Account Value $ 258,899 226,119 193,295 196,217 191,829 160,572 151,505 132,679   122,950 108,897   100,000
MSCI USA Minimum Volatility Index (75%)/Russell 3000 Value Index (25%)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI USA Minimum Volatility Index (75%)/Russell 3000 Value Index (25%)                        
Account Value $ 263,440 232,274 195,650 199,381 195,073 154,442 147,894 132,954   122,326 107,178   100,000
MSCI World Index (Net) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI World Index (Net) (USD)                        
Account Value $ 290,655 255,596 204,608 200,456 210,598 149,758 140,229 140,637   126,055 108,273 100,000  
MSCI World Minimum Volatility Index (Net) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI World Minimum Volatility Index (Net) (USD)                        
Account Value $ 214,609 183,107 164,694 166,284 168,375 143,914 138,924 126,940   119,968 108,755 $ 100,000  
MSCI EFM (Emerging+Frontier Markets) Index (Net) (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI EFM (Emerging+Frontier Markets) Index (Net) (USD)                        
Account Value $ 146,874 129,853 115,521 126,249 157,289 104,349 109,271 119,457   104,930 82,567   100,000
ICE BofA USD 3-Month Deposit Offered Rate Constant Maturity Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name ICE BofA USD 3-Month Deposit Offered Rate Constant Maturity Index                        
Account Value $ 123,449 117,555 111,439 108,068 108,000 107,699 105,253 102,645   101,205 100,375   100,000
ICE BofA U.S. High Yield Constrained Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name ICE BofA U.S. High Yield Constrained Index (USD)                        
Account Value $ 161,818 148,082 133,187 133,413 140,441 121,984 121,616 115,424   112,837 99,116   100,000
70/30 Bloomberg U.S. Long Credit/U.S. Long Govt                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 70/30 Bloomberg U.S. Long Credit/U.S. Long Govt                        
Account Value $ 116,132 113,784 114,003 120,760 141,701 144,543 121,866 110,886   110,138 106,120   100,000
Bloomberg Long A+ U.S. Credit Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg Long A+ U.S. Credit Index (USD)                        
Account Value $ 119,645 117,058 115,833 122,159 143,776 143,726 123,200 112,672   111,922 107,822   100,000
Bloomberg Short U.S. Treasury 9-12 Month Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg Short U.S. Treasury 9-12 Month Index (USD)                        
Account Value $ 120,858 115,070 109,461 107,638 108,317 108,040 104,761 102,088   101,053 100,410   100,000
50/50 JPM EMBI Global Div & JPM GBI EM Global Div                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 50/50 JPM EMBI Global Div & JPM GBI EM Global Div                        
Account Value $ 127,574 117,219 108,522 107,658 127,933 117,000 115,514 111,175   110,851 99,863   100,000
Bloomberg 1-5 Year U.S. TIPS Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg 1-5 Year U.S. TIPS Index (USD)                        
Account Value $ 131,355 122,795 117,856 120,318 117,787 109,725 105,969 103,059   102,524 100,678   100,000
ICE BofA 1-3 Year U.S. Treasury Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name ICE BofA 1-3 Year U.S. Treasury Index (USD)                        
Account Value $ 116,608 110,372 106,715 106,680 109,849 109,571 104,773 101,288   101,304 100,729   100,000
Bloomberg A+ U.S. Credit Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg A+ U.S. Credit Index (USD)                        
Account Value $ 122,728 116,479 113,121 115,213 127,286 125,995 113,992 106,572   106,705 104,289   100,000
Bloomberg 1-5 Year U.S. TIPS Index (USD)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg 1-5 Year U.S. TIPS Index (USD)                        
Account Value $ 131,355 122,795 117,856 120,318 117,787 109,725 105,969 103,059   102,524 100,678   100,000
Bloomberg 1-5 Year U.S. TIPS Index (70%)/Bloomberg Commodity Index Total Return Index (20%)/S&P 500 Index (10%)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg 1-5 Year U.S. TIPS Index (70%)/Bloomberg Commodity Index Total Return Index (20%)/S&P 500 Index (10%)                        
Account Value $ 145,523 $ 136,410 $ 126,414 $ 134,241 $ 122,914 $ 104,557 $ 104,251 $ 104,373   $ 100,424 $ 98,293   $ 100,000