cross t's

cross (one's) t's

To be thorough or painstaking in attending to details.
See also: cross
References in periodicals archive ?
The failure of the SC Bodner Company to build accessible housing units is more than a failure to cross T's and dot I's.
Everybody wants to dot i's and cross t's and you notice the wine is still sitting there but they've just asked me to be a little careful while they're under great scrutiny and I'm happy to do that.