Selected Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Quarterly Financial Information [Line Items]
Net revenue	$ 164,700	$ 173,274	$ 194,011	$ 191,415	$ 181,001	$ 173,016	$ 203,436	$ 197,051	$ 723,400	$ 754,504	$ 713,947
Cost of revenue	150,249	157,575	171,431	169,420	160,908	157,641	183,158	178,427	648,675	680,134	645,388
Gross profit	14,451	15,699	22,580	21,995	20,093	15,375	20,278	18,624	74,725	74,370	68,559
Total operating expenses	18,618	20,837	21,345	19,374	25,768	22,135	28,804	25,895	80,174	102,602	103,420
Operating income (loss)	(4,167)	(5,138)	1,235	2,621	(5,675)	(6,760)	(8,526)	(7,271)	(5,449)	(28,232)	(34,861)
Total other income (expense)	(2,226)	(3,640)	581	(812)	(1,196)	(677)	(2,491)	(1,340)	(6,097)	(5,704)	11,533
Income tax expense (benefit)	2,092	700	753	1,137	1,804	392	674	909	4,682	3,779	3,035
Equity in losses of affiliates, net of tax				(134)	(160)	(418)	(726)	(311)	(134)	(1,615)	(1,245)
Income (loss) from continuing operations	(8,485)	(9,478)	1,063	538	(8,835)	(8,247)	(12,417)	(9,831)	(16,362)	(39,330)	(27,608)
Inocme (loss) from discontinued operations			1	79	(6)	(59)	(133)	(827)	80	(1,025)	(10,500)
Net income (loss)	$ (8,485)	$ (9,478)	$ 1,064	$ 617	$ (8,841)	$ (8,306)	$ (12,550)	$ (10,658)	$ (16,282)	$ (40,355)	$ (38,108)
Net loss per share - basic and diluted:
Income (loss) from continuing operations	$ (0.16)	$ (0.18)	$ 0.02	$ 0.01	$ (0.17)	$ (0.17)	$ (0.29)	$ (0.22)	$ (0.32)	$ (0.84)	$ (0.63)
Income (loss) from discontinued operations								$ (0.02)	$ 0.00	$ (0.02)	$ (0.24)
Net income (loss)	$ (0.16)	$ (0.18)	$ 0.02	$ 0.01	$ (0.17)	$ (0.17)	$ (0.29)	$ (0.24)	$ (0.32)	$ (0.86)	$ (0.87)