Hello Dhruv,
Actually, in T-code SMW01, you could get most of the details of the bdoc. 
- Clicking on the first buttion in the red box: you can find the information such as Bdoc ID, Bdoc state, Flow context, etc.
- Clicking on the second button in the red box: you can find the classic part of the bdoc.
- Clicking ont the third button in the red box: you can find the extended part of the bdoc.
May I know what kind of information you want to get from table SMW3_BDOC?
Thanks,
Best regards,
Julin Xin