Shareholder Report, Holdings (Details)	Apr. 30, 2026
C000017646 \| Alphabet9289207
Holdings [Line Items]
Percent of Total Investments	2.80%
C000017646 \| Citigroup9289272
Holdings [Line Items]
Percent of Total Investments	1.90%
C000017646 \| Cisco Systems9289268
Holdings [Line Items]
Percent of Total Investments	1.80%
C000017646 \| Bristol-Myers Squibb9289258
Holdings [Line Items]
Percent of Total Investments	1.70%
C000017646 \| Verizon Communications9289596
Holdings [Line Items]
Percent of Total Investments	1.70%
C000017646 \| QUALCOMM9289533
Holdings [Line Items]
Percent of Total Investments	1.70%
C000017646 \| Altria Group9289209
Holdings [Line Items]
Percent of Total Investments	1.60%
C000017646 \| Merck9289477
Holdings [Line Items]
Percent of Total Investments	1.50%
C000017646 \| Wells Fargo9289617
Holdings [Line Items]
Percent of Total Investments	1.40%
C000017646 \| Dell Technologies9289315
Holdings [Line Items]
Percent of Total Investments	1.40%
C000142889 \| Alphabet9289207
Holdings [Line Items]
Percent of Total Investments	2.80%
C000142889 \| Citigroup9289272
Holdings [Line Items]
Percent of Total Investments	1.90%
C000142889 \| Cisco Systems9289268
Holdings [Line Items]
Percent of Total Investments	1.80%
C000142889 \| Bristol-Myers Squibb9289258
Holdings [Line Items]
Percent of Total Investments	1.70%
C000142889 \| Verizon Communications9289596
Holdings [Line Items]
Percent of Total Investments	1.70%
C000142889 \| QUALCOMM9289533
Holdings [Line Items]
Percent of Total Investments	1.70%
C000142889 \| Altria Group9289209
Holdings [Line Items]
Percent of Total Investments	1.60%
C000142889 \| Merck9289477
Holdings [Line Items]
Percent of Total Investments	1.50%
C000142889 \| Wells Fargo9289617
Holdings [Line Items]
Percent of Total Investments	1.40%
C000142889 \| Dell Technologies9289315
Holdings [Line Items]
Percent of Total Investments	1.40%