I like to deload every 8-10 weeks with a 5-way split. For me personally, it's easy to schedule a deload week with a 5-way split.
With something like a 3-way split, I do 3 cycles on, 1 cycle off (keep in mind a cycle is only 4-5 days).
For deload I'll either do active recovery or just some high rep stuff. Be sure to eat a lot and take advantage of the recovery time. With 3-ways, deload cycles are easy because they are only a few days, but with 5-ways I have a hell of a time taking a whole week off. But it's usually for the best. I always come off of a deload week bigger and stronger.