v3.26.3
Employee Benefit Plan, Fair Value and NAV (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
EBP, Investment, Fair Value and NAV [Line Items]    
Investments, at fair value: $ 1,189,562 $ 1,062,214
Total Investments 1,222,664 1,100,577
Advanced Drainage Systems, Inc. Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments, at fair value: $ 595,111 $ 562,419
EBP, Investment, Number of Shares 4,300 5,200
EBP, Investment, Number of Shares 4,300 5,200
EBP, Investment, Excluding Plan Interest in Master Trust, Cost $ 492,800 $ 587,100
EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment 3,400 3,500
Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments, at fair value: 594,451 499,795
Stable Value Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments, at fair value: 33,102 38,363
Fair Value, Inputs, Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments, at fair value: 1,189,562 1,062,214
Fair Value, Inputs, Level 1 | Advanced Drainage Systems, Inc. Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments, at fair value: 595,111 562,419
Fair Value, Inputs, Level 1 | Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments, at fair value: 594,451 499,795
Fair Value Measured at Net Asset Value Per Share | Stable Value Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value $ 33,102 $ 38,363