Customer and Geographic Information (Tables)

3 Months Ended

Oct. 31, 2012

Geographic Areas, Revenues from External Customers [Abstract]

Schedule of net sales, as a percentage, by geography and customer type

	Three months ended October 31,
	2012		2011
United States
U.S. government	43.4	%	48.3	%
Commercial	13.5	%	12.9	%
Total United States	56.9	%	61.2	%
International	43.1	%	38.8	%