Is data from destroyed volume destroyed.

Hello,

I am wondering what happens in a multple SVM scenario when SVM A destroy a volume X.  Then if SVM B creates a new volumes Y where blocks previously belonging to volume X  are now belonging to Y.  Is the data from volume X available through volume Y ?

Basically, how can I reassure a very cautious tenant about the security of his data.  Is there official documentastion on this ?

Thank you,