Total Assets of Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jul. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 475,575	$ 451,646
Operating Segments
Segment Reporting Information [Line Items]
Total assets	269,872	247,551
Operating Segments | Americas
Segment Reporting Information [Line Items]
Total assets	38,459	73,254
Operating Segments | Asia
Segment Reporting Information [Line Items]
Total assets	143,371	78,749
Operating Segments | Europe
Segment Reporting Information [Line Items]
Total assets	66,046	81,327
Operating Segments | All Other
Segment Reporting Information [Line Items]
Total assets	21,996	14,221
Corporate-level activity
Segment Reporting Information [Line Items]
Total assets	$ 205,703	$ 204,095