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EQUITY ARRANGEMENTS (Detail) $ / shares in Units, $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |
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May 15, 2023 $ / shares | Jun. 03, 2021 $ / shares | Apr. 28, 2021 $ / shares | Jun. 09, 2020 $ / shares | May 15, 2020 $ / shares | Mar. 31, 2022 USD ($) shares | Jun. 30, 2021 USD ($) $ / shares shares | Apr. 28, 2021 $ / shares shares | May 31, 2020 USD ($) $ / shares shares | Feb. 29, 2020 $ / shares shares | Nov. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares | May 31, 2017 USD ($) counterparty $ / shares shares | Mar. 31, 2015 USD ($) shares | Apr. 02, 2022 USD ($) financial_institution $ / shares shares | Feb. 28, 2022 USD ($) shares | Jan. 01, 2022 USD ($) shares | Nov. 07, 2019 $ / shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward share purchase contract (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,645,510 |  |  |  |
Forward share purchase contract | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350.0 |  |  |  |
Shares of convertible preferred stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000 |  | 750,000 |
Preferred stock | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 620.3 |  | $ 620.3 |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 191.34 |  |  |  | $ 190.98 |  |  |
Preferred stock conversion rate number of common stock shares (in shares) |  |  |  |  |  |  |  |  |  |  | $ 5.2263 |  |  |  |  |  |  |
Beneficial conversion feature | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.4 |  |  |  |  |
Preferred stock, redemption price per share before redemption date (in dollars per share) |  |  |  |  |  |  | $ 148.04 |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible securities (in shares) | shares |  |  |  |  |  |  | 1,469,055 |  |  |  |  |  |  |  |  |  |  |
Term of forward purchase contract |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
2020 Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |  |
Accelerated Share Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  | $ 2,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, percent of shares for initial delivery |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) | shares |  |  |  |  |  | 10,756,770 |  |  |  |  |  |  |  |  |  |  |  |
Open Market, Share Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300.0 |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,888,601 |  |
Series D Preferred Stock | 2019 Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock | $ |  |  |  |  |  |  |  |  |  |  | $ 620.3 |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of convertible preferred stock (in shares) | shares |  |  |  |  |  |  | 750,000 |  | 750,000 |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  | $ 1,000 |  |  |  |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |
Preferred stock conversion rate number of common stock shares (in shares) |  | $ 6.7548 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate of preferred stock |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Preferred dividend rate (in dollars per share) |  |  |  |  |  |  |  |  | $ 50.00 |  |  |  |  |  |  |  |  |
Preferred stock, redemption, price per share (in dollars per share) |  |  | $ 1,002.5 |  |  |  |  | 1,002.5 |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share, percentage of liquidation preference |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share before redemption date (in dollars per share) |  | $ 148.04 | $ 1,000 |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Repurchase of preferred stock | $ |  |  |  |  |  |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |
Preferred stock conversion rate |  | 6.7548 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 5,463,750 |  |  |  |  |  |  |  |  |
Series C Preferred Stock | 2017 Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock | $ |  |  |  |  |  |  |  |  |  |  | $ 605.0 |  |  |  |  |  |  |
2019 Equity Units and Capped call Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward share purchase contract (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 4,700,000 |  |  |  |  |  |  |
Approximate net proceeds | $ |  |  |  |  |  |  |  |  |  |  | $ 734.5 |  |  |  |  |  |  |
Shares of convertible preferred stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 750,000 |  |  |  |  |  |  |
Proceeds used for capped call transactions | $ |  |  |  |  |  |  |  |  |  |  | $ 19.2 |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Preferred stock redemption |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Purchase price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |
Maximum settlement rate (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 0.6272 |  |  |  | 0.6284 |  |  |
Stated value (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  | $ 159.13 |  |  | $ 159.45
Present value of contract adjustment payments | $ |  |  |  |  |  |  |  |  |  |  | $ 114.2 |  |  |  |  |  |  |
Shares of stock deliverable on early settlement of contract |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |
2019 Equity Units and Capped call Transactions | 2019 Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate per annum |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |  |
Present value of contract adjustment payments | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28.8 |  |  |
Accretion expense | $ |  |  |  |  |  |  |  |  |  |  | $ 1.3 |  |  |  |  |  |  |
Contract term |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
2019 Equity Units and Capped call Transactions | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds used for capped call transactions | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.2 |  |  |
Preferred stock conversion rate number of common stock shares (in shares) |  |  |  |  |  |  |  |  |  |  | $ 5.2263 |  |  |  |  |  |  |
Upper strike percentage above closing price |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Number of common shares purchased under call option (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,900,000 |  |  |
Dividend rate of preferred stock |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
2019 Equity Units and Capped call Transactions | Series D Preferred Stock | 2019 Capped Call |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds used for capped call transactions | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.1 |  |  |
2019 Equity Units and Capped call Transactions | Series D Preferred Stock | Call Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.90 |  |  |
2019 Equity Units and Capped call Transactions | Series D Preferred Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 207.29 |  |  |  | 206.89 |  |  |
2019 Equity Units and Capped call Transactions | Series D Preferred Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 191.34 |  |  |  | $ 190.98 |  |  |
2019 Equity Units and Capped call Transactions | Series D Preferred Stock | 2019 Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, quarterly payments | $ |  |  |  |  |  |  |  |  |  |  | $ 114.2 |  |  |  |  |  |  |
2019 Equity Units and Capped call Transactions | 2022 Purchase Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |
Cash settlement on forward stock purchase contract | $ |  |  |  |  |  |  |  |  |  |  | $ 750.0 |  |  |  |  |  |  |
2018 Capped Call Transactions | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds used for capped call transactions | $ |  |  |  |  |  |  |  |  |  |  |  | $ 57.3 |  |  |  |  |  |
Option term |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Number of common shares purchased under call option (in shares) | shares |  |  |  |  |  |  |  |  |  | 3,200,000 |  | 3,200,000 |  |  |  |  |  |
Shares settled (in shares) | shares |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |
Shares received on settlement (in shares) | shares |  |  |  |  |  |  |  | 344,004 |  | 61,767 |  |  |  |  |  |  |  |
Average reference price (in dollars per share) |  |  |  |  |  |  |  | $ 209.80 |  | $ 162.26 |  |  |  |  |  |  |  |
2018 Capped Call Transactions | Call Option | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 17.96 |  |  |  |  |  |
2018 Capped Call Transactions | Maximum | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  | $ 165.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Capped Call Transactions | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price as a percentage of closing stock price |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Capped Call Transactions | Series C Preferred Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  | $ 148.34 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Equity Units and Capped call Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of convertible preferred stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 750,000 |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Purchase price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |
Stated value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |
Dividend rate per annum |  |  |  |  |  |  |  |  | 5.375% |  |  |  |  |  |  |  |  |
Present value of contract adjustment payments | $ |  |  |  |  |  |  |  |  | $ 117.1 |  |  |  |  |  |  |  |  |
Accretion expense | $ |  |  |  |  |  |  |  |  | 1.3 |  |  |  |  |  |  |  |  |
Common stock price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.43 |  |  |  |  |
Number of common shares purchased under call option (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  |  |
Proceeds from issuance or sale of equity | $ |  |  |  |  |  |  |  |  | $ 750.0 |  |  |  | $ 727.5 |  |  |  |  |
Proceeds used to enter into capped call transactions | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.1 |  |  |  |  |
Preferred dividend rate (in dollars per share) |  |  |  |  | $ 50.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum settlement rate (in shares) | shares |  |  |  |  |  |  |  |  | 0.7285 |  |  |  |  |  |  |  |  |
Conversion reference price (in dollars per share) |  |  |  |  |  |  |  |  | $ 137.26 |  |  |  |  |  |  |  |  |
Term of forward purchase contract |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
2017 Equity Units and Capped call Transactions | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred dividend rate (in dollars per share) | $ 100.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Equity Units and Capped call Transactions | Call Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds used to enter into capped call transactions | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.1 |  |  |  |  |
2017 Equity Units and Capped call Transactions | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock conversion rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.2362 |  |  |
2017 Equity Units and Capped call Transactions | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Number of financial institutions | financial_institution |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Option term |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  |  |  |  |  |  | $ 148.47 |  |  |  |  |  |  |  |  |
Preferred stock conversion rate number of common stock shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.1627 |  |  |  |  |
Dividend rate of preferred stock |  |  |  |  | 5.00% |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Preferred stock conversion rate |  |  |  |  |  |  |  |  | 6.7352 |  |  |  |  |  |  |  |  |
Common shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 5,463,750 |  |  |  |  |  |  |  |  |
Number of counterparties | counterparty |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Strike price as a percentage of closing stock price |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |
2017 Equity Units and Capped call Transactions | Series C Preferred Stock | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate of preferred stock | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Equity Units and Capped call Transactions | Series C Preferred Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 179.53 |  |  |  |  |
2017 Equity Units and Capped call Transactions | Series C Preferred Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to issuer's equity, strike price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 162.27 |  |  |  |  |
2017 Equity Units and Capped call Transactions | Series C Preferred Stock | 2017 Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, quarterly payments | $ |  |  |  |  |  |  |  |  |  |  | $ 117.1 |  |  |  |  |  |  |

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- Definition Cash Settlement on Forward Stock Purchase Contract + References No definition available. + Details
Name: | swk_CashSettlementonForwardStockPurchaseContract
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