v3.26.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Aug. 31, 2026
Aug. 31, 2026
Aug. 31, 2026
C000153951 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Equity Income Fund (Class C/JHERX)    
Average Annual Return, Percent 21.84% 9.51% 10.00%
C000153950 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Equity Income Fund (Class A/JHEIX)    
Average Annual Return, Percent 17.30% 9.15% 10.21%
C000008922 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Equity Income Fund (Class 1/JIEMX)    
Average Annual Return, Percent 24.00% 10.70% 11.18%
C000100841 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class A/JFCAX)    
Average Annual Return, Percent 1.75% 6.50% 13.02%
C000100842 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class C/JFCCX)    
Average Annual Return, Percent 5.38% 6.84% 12.81%
C000100843 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class I/JFCIX)    
Average Annual Return, Percent 7.39% 7.91% 13.95%
C000153970 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class R2/JFACX)    
Average Annual Return, Percent 6.97% 7.50% 13.53%
C000100846 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class R4/JFARX)    
Average Annual Return, Percent 7.27% 7.83% 13.86%
C000153971 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class R6/JFAIX)    
Average Annual Return, Percent 7.51% 8.04% 14.07%
C000107913 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class R6/JHASX)    
Average Annual Return, Percent 3.95% 2.46% 3.28%
C000113522 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class R2/JHARX)    
Average Annual Return, Percent 3.59% 2.06% 2.84%
C000107912 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class NAV)    
Average Annual Return, Percent 3.94% 2.48% 3.31%
C000107911 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class I/JHAIX)    
Average Annual Return, Percent 3.88% 2.37% 3.18%
C000107910 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class C/JHACX)    
Average Annual Return, Percent 1.93% 1.35% 2.17%
C000107909 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class A/JHAAX)    
Average Annual Return, Percent (1.65%) 1.02% 2.35%
C000127063 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class A/JHGEX)    
Average Annual Return, Percent 9.13% 7.03% 9.31%
C000152689 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class C/JGECX)    
Average Annual Return, Percent 13.14% 7.38% 9.11%
C000127064 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class I/JGEFX)    
Average Annual Return, Percent 15.34% 8.47% 10.21%
C000127065 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class NAV)    
Average Annual Return, Percent 15.39% 8.59% 10.34%
C000152690 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class R2/JGERX)    
Average Annual Return, Percent 14.88% 8.06% 9.81%
C000152691 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class R4/JGETX)    
Average Annual Return, Percent 15.11% 8.36% 10.13%
C000152692 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class R6/JGEMX)    
Average Annual Return, Percent 15.40% 8.56% 10.32%
Without Sales Load [Member] | C000153951 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Equity Income Fund (Class C/JHERX)—excluding sales charge    
Average Annual Return, Percent 22.63% 9.51% 10.00%
Without Sales Load [Member] | C000153950 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Equity Income Fund (Class A/JHEIX)—excluding sales charge    
Average Annual Return, Percent 23.48% 10.28% 10.78%
Without Sales Load [Member] | C000100841 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class A/JFCAX)—excluding sales charge    
Average Annual Return, Percent 7.10% 7.60% 13.61%
Without Sales Load [Member] | C000100842 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class C/JFCCX)—excluding sales charge    
Average Annual Return, Percent 6.33% 6.84% 12.81%
Without Sales Load [Member] | C000107910 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class C/JHACX)—excluding sales charge    
Average Annual Return, Percent 2.93% 1.35% 2.17%
Without Sales Load [Member] | C000107909 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class A/JHAAX)—excluding sales charge    
Average Annual Return, Percent 3.57% 2.06% 2.88%
Without Sales Load [Member] | C000127063 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class A/JHGEX)—excluding sales charge    
Average Annual Return, Percent 14.87% 8.14% 9.88%
Without Sales Load [Member] | C000152689 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Global Equity Fund (Class C/JGECX)—excluding sales charge    
Average Annual Return, Percent 14.14% 7.38% 9.11%
Russell 1000 Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 1000 Index    
Average Annual Return, Percent 19.77% 12.10% 15.13%
Russell 3000 Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 3000 Index    
Average Annual Return, Percent 20.10% 11.80% 14.84%
Bloomberg U S Aggregate Bond Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index    
Average Annual Return, Percent 1.89% (0.29%) 1.40%
MSCI World Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI World Index    
Average Annual Return, Percent 20.37% 11.21% 13.01%
Russell 1000 Value Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 1000 Value Index    
Average Annual Return, Percent 29.72% 11.84% 11.76%
Thirty MSCI ACWI 70 Bloomberg Global Aggregate Bond USD Hedged Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name 30% MSCI ACWI/ 70% Bloomberg Global Aggregate Bond (USD Hedged) Index    
Average Annual Return, Percent 7.73% 3.66% 5.10%
ICE BofA 0 3 Month U S Treasury Bill Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name ICE BofA 0-3 Month U.S. Treasury Bill Index    
Average Annual Return, Percent 3.82% 3.72% 2.40%
MSCI World Value Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI World Value Index    
Average Annual Return, Percent 23.41% 11.36% 10.32%