Shareholder Fees - ClearBridge Mid Cap Growth Fund	Mar. 01, 2021 USD ($)
Class A
Shareholder Fees:
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	5.75%	[1],[2]
Maximum Deferred Sales Charge (as a percentage)	none	[3],[4]
Maximum Account Fee	$ 15	[5]
Class C
Shareholder Fees:
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	none
Maximum Deferred Sales Charge (as a percentage)	1.00%	[3]
Maximum Account Fee	$ 15	[5]
Class R
Shareholder Fees:
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	none
Maximum Deferred Sales Charge (as a percentage)	none	[3]
Maximum Account Fee	none	[5]
Class A2
Shareholder Fees:
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	5.75%	[1]
Maximum Deferred Sales Charge (as a percentage)	none	[3],[4]
Maximum Account Fee	$ 15	[5]
Class I
Shareholder Fees:
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	none
Maximum Deferred Sales Charge (as a percentage)	none	[3]
Maximum Account Fee	none	[5]
Class IS
Shareholder Fees:
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	none
Maximum Deferred Sales Charge (as a percentage)	none	[3]
Maximum Account Fee	none	[5]

[1] Shareholders purchasing Class A and Class A2 shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Additional information about each share class — Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] Maximum deferred sales charge (load) may be reduced over time.

[4] You may buy Class A or Class A2 shares in amounts of $1,000,000 or more at net asset value (without an initial sales charge), but if you redeem those shares within 18 months of their purchase, you will pay a contingent deferred sales charge of 1.00%.

[5] If the value of your account is below $1,000 ($250 for retirement plans that are not employer-sponsored), the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly by the fund or your Service Agent (with an annual maximum of $15.00 per account). Please contact your Service Agent or the fund for more information.