Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2025 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2015 |
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| C000107855 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class A/JSGAX) | ||||||||||||
| Account Value | $ 33,449.102587 | $ 33,449.102587 | $ 33,449.102587 | $ 31,658.392471 | $ 21,671.83139 | $ 24,411.374728 | $ 22,180.960483 | $ 14,653.35423 | $ 14,644.331272 | $ 13,050.046037 | $ 10,704.549853 | $ 9,361.84682 | $ 9,500 |
| Average Annual Return, Percent | 0.37% | 16.75% | 12.83% | ||||||||||
| C000107855 [Member] | Without Sales Load [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class A/JSGAX)—excluding sales charge | ||||||||||||
| Average Annual Return, Percent | 5.66% | 17.95% | 13.41% | ||||||||||
| C000145658 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class C/JSGCX) | ||||||||||||
| Account Value | $ 32,665.612027 | $ 32,665.612027 | $ 32,665.612027 | 31,151.489518 | 21,482.368038 | 24,391.127565 | 22,326.350706 | 14,855.0729 | 14,958.691005 | 13,423.5324729999 | 11,098.359372 | 9,775.8886 | 10,000 |
| Average Annual Return, Percent | 3.91% | 17.07% | 12.57% | ||||||||||
| C000145658 [Member] | Without Sales Load [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class C/JSGCX)—excluding sales charge | ||||||||||||
| Average Annual Return, Percent | 4.86% | 17.07% | 12.57% | ||||||||||
| C000107856 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class I/JSGIX) | ||||||||||||
| Account Value | $ 903,053.492287 | $ 903,053.492287 | $ 903,053.492287 | 852,536.94423 | 581,931.348585 | 654,190.422747 | 592,942.423276 | 390,504.73916 | 389,509.989074 | 346,089.644563 | 283,391.281717 | 247,079.235 | 250,000 |
| Average Annual Return, Percent | 5.93% | 18.25% | 13.70% | ||||||||||
| C000107857 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class NAV) | ||||||||||||
| Account Value | $ 36,531.71339 | $ 36,531.71339 | $ 36,531.71339 | 34,450.926358 | 23,493.752448 | 26,384.39156 | 23,881.994178 | 15,711.066262 | 15,649.987803 | 13,887.078216 | 11,355.17462 | 9,890.7511 | 10,000 |
| Average Annual Return, Percent | 6.04% | 18.38% | 13.83% | ||||||||||
| C000153994 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class R2/JSGRX) | ||||||||||||
| Account Value | $ 34,739.548166 | $ 34,739.548166 | $ 34,739.548166 | 32,927.967311 | 22,571.408222 | 25,464.672478 | 23,171.835358 | 15,321.548545 | 15,340.256141 | 13,681.162741 | 11,243.603939 | 9,836.5524 | 10,000 |
| Average Annual Return, Percent | 5.50% | 17.79% | 13.26% | ||||||||||
| C000153995 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class R4/JHSGX) | ||||||||||||
| Account Value | $ 35,677.386601 | $ 35,677.386601 | $ 35,677.386601 | 33,730.208134 | 23,042.312094 | 25,928.490989 | 23,512.665054 | 15,511.035543 | 15,484.927645 | 13,781.339629 | 11,291.503583 | 9,853.377 | 10,000 |
| Average Annual Return, Percent | 5.77% | 18.13% | 13.56% | ||||||||||
| C000153996 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | U.S. Growth Fund (Class R6/JSGTX) | ||||||||||||
| Account Value | $ 3,652,015.081 | $ 3,652,015.081 | $ 3,652,015.081 | 3,444,066.642 | 2,349,161.94 | 2,636,794.832 | 2,387,813.549 | 1,571,304.113 | 1,565,295.086 | 1,389,096.908 | 1,136,156.751 | 989,075.11 | 1,000,000 |
| Average Annual Return, Percent | 6.04% | 18.37% | 13.83% | ||||||||||
| Russell 1000 Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Russell 1000 Index | ||||||||||||
| Account Value | $ 31,551.336428 | $ 31,551.336428 | $ 31,551.336428 | 29,262.751365 | 22,532.698324 | 24,597.267244 | 21,715.601688 | 13,522.623113 | 14,702.68406 | 13,451.565642 | 11,801.831517 | 10,050.2656 | 10,000 |
| Average Annual Return, Percent | 7.82% | 18.47% | 12.18% | ||||||||||
| Russell 1000 C000107856 Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Account Value | $ 788,783.410663 | $ 788,783.410663 | $ 788,783.410663 | 731,568.784093 | 563,317.458073 | 614,931.681082 | 542,890.04219 | 338,065.577811 | 367,567.101483 | 336,289.141046 | 295,045.787923 | 251,256.64 | 250,000 |
| Russell 1000 C000153996 Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Account Value | $ 3,155,133.642654 | 3,155,133.642654 | 3,155,133.642654 | 2,926,275.136373 | 2,253,269.832293 | 2,459,726.72433 | 2,171,560.168761 | 1,352,262.311245 | 1,470,268.405935 | 1,345,156.564186 | 1,180,183.151692 | 1,005,026.56 | 1,000,000 |
| Russell 1000 Growth Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Russell 1000 Growth Index | ||||||||||||
| Account Value | $ 40,883.284294 | $ 40,883.284294 | $ 40,883.284294 | 37,938.099548 | 27,294.283278 | 30,633.817222 | 26,643.393542 | 16,371.388487 | 16,223.528706 | 14,389.173168 | 11,867.036922 | 10,251.6948 | 10,000 |
| Average Annual Return, Percent | 7.76% | 20.09% | 15.12% | ||||||||||
| Russell 1000 Growth C000107856 Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Account Value | $ 1,022,082.107328 | $ 1,022,082.107328 | $ 1,022,082.107328 | 948,452.488675 | 682,357.081927 | 765,845.430513 | 666,084.838513 | 409,284.712148 | 405,588.217635 | 359,729.329196 | 296,675.923044 | 256,292.37 | 250,000 |
| Russell 1000 Growth C000153996 Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Account Value | $ 4,088,328.429305 | $ 4,088,328.429305 | $ 4,088,328.429305 | $ 3,793,809.954693 | $ 2,729,428.327703 | $ 3,063,381.722047 | $ 2,664,339.354048 | $ 1,637,138.848589 | $ 1,622,352.870539 | $ 1,438,917.316782 | $ 1,186,703.692175 | $ 1,025,169.48 | $ 1,000,000 |