S-K 1602(a)(4) Forepart, Adjusted NTBV	12 Months Ended
S-K 1602(a)(4) Forepart, Adjusted NTBV	Dec. 31, 2025 $ / shares
Redemption at 25 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	$ 6.68
Redemption at 25 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	6.70
Redemption at 50 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	5.74
Redemption at 50 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	5.77
Redemption at 75 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	4.08
Redemption at 75 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	4.10
Redemption at 100 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	0.26
Redemption at 100 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	0.25
Offering Price of $10.00 [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	7.28
Offering Price of $10.00 [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	7.30
Difference between NTBV and Offering Price [Member] \| Redemption at 25 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	3.32
Difference between NTBV and Offering Price [Member] \| Redemption at 25 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	3.30
Difference between NTBV and Offering Price [Member] \| Redemption at 50 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	4.26
Difference between NTBV and Offering Price [Member] \| Redemption at 50 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	4.23
Difference between NTBV and Offering Price [Member] \| Redemption at 75 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	5.92
Difference between NTBV and Offering Price [Member] \| Redemption at 75 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	5.90
Difference between NTBV and Offering Price [Member] \| Redemption at 100 Percent of Maximum [Member] \| Over-allotment Option Not Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	9.74
Difference between NTBV and Offering Price [Member] \| Redemption at 100 Percent of Maximum [Member] \| Over-allotment Option Exercised [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	9.75
Full Over-Allotment [Member] \| No Redemption [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	7.30
Full Over-Allotment [Member] \| Redemption at 25 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	6.70
Full Over-Allotment [Member] \| Redemption at 50 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	5.77
Full Over-Allotment [Member] \| Redemption at 75 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	4.10
Full Over-Allotment [Member] \| Redemption at 100 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	0.25
No Over-Allotment [Member] \| No Redemption [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	7.28
No Over-Allotment [Member] \| Redemption at 25 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	6.68
No Over-Allotment [Member] \| Redemption at 50 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	5.74
No Over-Allotment [Member] \| Redemption at 75 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	4.08
No Over-Allotment [Member] \| Redemption at 100 Percent of Maximum [Member]
Spac Forepart Adjusted Net Tangible Book Value Per Share Line Items
Net Tangible Book Value, Adjusted, per Share	$ 0.26

AfterNext Acquisition I Corp. S-1/A