Business Acquisitions - Narrative (Details)						3 Months Ended		4 Months Ended	9 Months Ended
	Jun. 08, 2023 USD ($)	Mar. 30, 2023 location	Mar. 20, 2023 shares	Apr. 01, 2022 USD ($) shares	Mar. 31, 2022 USD ($) $ / shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($) segment shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Principal operating segment | segment									3
Expected tax deductible goodwill amount											$ 53,600,000
Proceeds from employees for share purchases									$ 3,253,000	$ 0
Lawson
Business Acquisition [Line Items]
Number of shares authorized (in shares) | shares				18,240,334
Expected tax deductible goodwill amount											$ 0
Total consideration exchanged				$ 353,401,000
DSG common stock closing price on March 31, 2022 (in USD per share) | $ / shares					$ 19.27
Hisco
Business Acquisition [Line Items]
Expected tax deductible goodwill amount						$ 42,900,000		$ 42,900,000	$ 42,900,000
Number of locations | location		38
Total consideration exchanged								268,500,000
Cash acquired from acquisition								12,200,000
Cash exchanged for equity related to retention bonuses	$ 37,500,000
Stock issued (in shares) | shares						144,608			144,608
Compensation expense						$ 400,000			$ 400,000
Common stock, value, subscription price	22.50
Maximum stock employees can purchase	$ 25,000,000
Decrease in goodwill						700,000		700,000	700,000
Total purchase consideration exchanged, net of cash acquired						2,000,000		$ 2,000,000	2,000,000
Proceeds from employees for share purchases						$ 3,250,000			$ 3,250,000
Hisco | Trade names
Business Acquisition [Line Items]
Useful life (in years)						8 years		8 years	8 years
Hisco | Customer relationships
Business Acquisition [Line Items]
Useful life (in years)						12 years		12 years	12 years
Hisco | Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Compensation expense						$ 10,100,000			$ 12,400,000
Frontier
Business Acquisition [Line Items]
Total consideration exchanged					$ 25,674,000
Potential earn-out payment					$ 3,000,000
Other Acquisitions
Business Acquisition [Line Items]
Merger transaction costs						$ (100,000)	$ 2,400,000		$ 9,100,000	$ 10,800,000
TestEquity And Gexpro Services Former Owners | Lawson
Business Acquisition [Line Items]
Number of shares authorized (in shares) | shares				20,600,000
TestEquity And Gexpro | Lawson | Earnout Shares
Business Acquisition [Line Items]
Number of shares authorized (in shares) | shares			3,400,000