Accumulated Other Comprehensive Items (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) at beginning of period			$ 3,510
Foreign currency translation adjustment	$ 1,977	$ 493	31	$ (6,661)
Net unrealized holding gain on securities	(2)	7	29	1
Other comprehensive income (loss)	1,975	$ 500	60	$ (7,471)
Accumulated other comprehensive income (loss) at end of period	3,570		3,570
Foreign currency items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) at beginning of period			7,670
Foreign currency translation adjustment			31
Other comprehensive income (loss)			31
Accumulated other comprehensive income (loss) at end of period	7,701		7,701
Pension items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) at beginning of period			(4,206)
Accumulated other comprehensive income (loss) at end of period	(4,206)		(4,206)
Unrealized gains (losses) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) at beginning of period			46
Net unrealized holding gain on securities			29
Other comprehensive income (loss)			29
Accumulated other comprehensive income (loss) at end of period	$ 75		$ 75