v3.26.1
Cover - shares
3 Months Ended
Jun. 30, 2026
Aug. 12, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Quarterly Report true  
Document Transition Report false  
Document Fiscal Period Focus Q1  
Entity Registrant Name HARBOURVEST PRIVATE EQUITY SECONDARIES FUND (TE) L.P.  
Entity Central Index Key 0002117580  
Entity Address, State or Province MA  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One One Lincoln Street  
Entity Address, Address Line Two Suite 1700  
Entity Address, City or Town Boston  
Entity Address, Postal Zip Code 02111  
Current Fiscal Year End Date --03-31  
City Area Code 617  
Local Phone Number 348-3707  
Entity Current Reporting Status Yes  
Entity File Number 000-56842  
Entity Tax Identification Number 41-4352971  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Interactive Data Current Yes  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   189,002