Document and Entity Information Document - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 05, 2020
Jun. 30, 2019
Cover page. [Abstract]      
Document type 10-K    
Document annual report true    
Document period end date Dec. 31, 2019    
Document transition report false    
Entity file number 000-50600    
Entity registrant name Blackbaud, Inc.    
Entity incorporation, state or country code DE    
Entity tax identification number 11-2617163    
Entity address, address line one 65 Fairchild Street    
Entity address, city or town Charleston    
Entity address, state or province SC    
Entity address, postal zip code 29492    
City area code 843    
Local phone number 216-6200    
Title of 12(b) security Common Stock, $0.001 Par Value    
Trading symbol BLKB    
Security exchange name NASDAQ    
Entity well-known seasoned issuer Yes    
Entity voluntary filers No    
Entity current reporting status Yes    
Entity interactive data current Yes    
Entity filer category Large Accelerated Filer    
Entity small business false    
Entity emerging growth company false    
Entity shell company false    
Entity public float     $ 3,578,045,224
Entity common stock, shares outstanding   49,142,338  
Documents incorporated by reference
Portions of the registrant's definitive Proxy Statement for the 2020 Annual Meeting of Stockholders currently scheduled to be held June 10, 2020 are incorporated by reference into Part III hereof. Such definitive Proxy Statement will be filed with the Securities and Exchange Commission no later than 120 days after the conclusion of the registrant's fiscal year ended December 31, 2019.
Amendment flag false    
Document fiscal year focus 2019    
Document fiscal period focus FY    
Entity central index key 0001280058    
Current fiscal year end date --12-31