Hi Martin,
Just to add to Maarten's excellent answer 'd'habitude' can be both 'usual' and 'usually' and we use both as translation in this sentence.
Not sure if you know the expression 'comme d'habitude' (as usual) which always reminds me of Claude François' song with the same title. Paul Anka wrote new English lyrics for Frank Sinatra and it became his signature song - 'My Way'.
Showing my age here but interesting little fact methinks!
If you want more info take a look at -
https://en.wikipedia.org/wiki/Comme_d%27habitude
https://www.youtube.com/watch?v=w22haP4hgsQ
Hope you enjoy it!