Expense Example - AB Value Fund	Feb. 26, 2021 USD ($)
Class A
Expense Example:
Expense Example, with Redemption, 1 Year	$ 522
Expense Example, with Redemption, 3 Years	727
Expense Example, with Redemption, 5 Years	949
Expense Example, with Redemption, 10 Years	1,586
Class C
Expense Example:
Expense Example, with Redemption, 1 Year	278	[1]
Expense Example, with Redemption, 3 Years	551
Expense Example, with Redemption, 5 Years	949
Expense Example, with Redemption, 10 Years	2,062
Advisor Class
Expense Example:
Expense Example, with Redemption, 1 Year	76
Expense Example, with Redemption, 3 Years	237
Expense Example, with Redemption, 5 Years	411
Expense Example, with Redemption, 10 Years	918
Class R
Expense Example:
Expense Example, with Redemption, 1 Year	147
Expense Example, with Redemption, 3 Years	456
Expense Example, with Redemption, 5 Years	787
Expense Example, with Redemption, 10 Years	1,724
Class K
Expense Example:
Expense Example, with Redemption, 1 Year	116
Expense Example, with Redemption, 3 Years	362
Expense Example, with Redemption, 5 Years	628
Expense Example, with Redemption, 10 Years	1,386
Class I
Expense Example:
Expense Example, with Redemption, 1 Year	73
Expense Example, with Redemption, 3 Years	227
Expense Example, with Redemption, 5 Years	395
Expense Example, with Redemption, 10 Years	$ 883

[1] If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.