Capitalization (Tables)

9 Months Ended

Feb. 28, 2013

Capitalization

Schedule of cash proceeds from and the aggregate intrinsic value of stock options exercised

	Three months ended				Nine months ended
	February 28, 2013		February 29, 2012		February 28, 2013		February 29, 2012
Cash proceeds from options exercised	$	321	$	152	$	672	$	1,477
Aggregate intrinsic value of options exercised	$	370	$	337	$	856	$	3,399