PARENT COMPANY CONDENSED FINANCIAL INFORMATION - Schedule of Balance Sheet (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Aug. 01, 2018	Jul. 31, 2018	Jul. 31, 2017
ASSETS
Cash and cash equivalents	$ 32,548		$ 92,138
Prepaid expenses and other current assets	31,445	$ 37,456	13,415
Total current assets	213,324	267,089	264,281
Other assets	7,325		8,821
Total assets	731,563	829,858	827,050
LIABILITIES, CONTINGENTLY REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
Accounts payable	85,898		78,212
Accrued expenses	112,658		88,426
Convertible Notes payable	0		50,274
Total current liabilities	256,850	273,026	276,356
Convertible Notes payable	7,432		14,256
Total long-term liabilities	386,835		407,874
Total liabilities	643,685	680,900	684,230
Contingently redeemable preferred stock, $0.01 par value per share. 35,000 shares authorized, issued and outstanding at July 31, 2019 and 2018	35,186		35,192
Stockholders' equity:
Preferred stock, $0.01 par value per share. 4,965,000 shares authorized at July 31, 2019 and July 31, 2018; zero shares issued and outstanding at July 31, 2019 and July 31, 2018	0		0
Common stock, $0.01 par value per share. Authorized 1,400,000,000 shares; 61,805,856 issued and outstanding shares at July 31, 2019; 60,742,859 issued and outstanding shares at July 31, 2018	618		608
Additional paid-in capital	7,477,327		7,467,855
Accumulated deficit	(7,426,287)	(7,357,431)	(7,363,569)
Accumulated other comprehensive income	1,034		2,734
Total stockholders' equity	52,692	113,766	107,628	$ 62,971
Total liabilities, contingently redeemable preferred stock and stockholders' equity	731,563	$ 829,858	827,050
Parent Company
ASSETS
Cash and cash equivalents	4,083		7,978
Prepaid expenses and other current assets	227		120
Total current assets	4,310		8,098
Investments in affiliates	96,940		188,534
Other assets	337		87
Due from subsidiaries	0		13,579
Total assets	101,587		210,298
LIABILITIES, CONTINGENTLY REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
Accounts payable	1,253		674
Accrued expenses	2,364		2,274
Convertible Notes payable	0		50,274
Total current liabilities	3,617		53,222
Convertible Notes payable	7,432		14,256
Due to subsidiaries	2,660
Total long-term liabilities	10,092		14,256
Total liabilities	13,709		67,478
Contingently redeemable preferred stock, $0.01 par value per share. 35,000 shares authorized, issued and outstanding at July 31, 2019 and 2018	35,186		35,192
Stockholders' equity:
Preferred stock, $0.01 par value per share. 4,965,000 shares authorized at July 31, 2019 and July 31, 2018; zero shares issued and outstanding at July 31, 2019 and July 31, 2018	0		0
Common stock, $0.01 par value per share. Authorized 1,400,000,000 shares; 61,805,856 issued and outstanding shares at July 31, 2019; 60,742,859 issued and outstanding shares at July 31, 2018	618		608
Additional paid-in capital	7,477,327		7,467,855
Accumulated deficit	(7,426,287)		(7,363,569)
Accumulated other comprehensive income	1,034		2,734
Total stockholders' equity	52,692		107,628
Total liabilities, contingently redeemable preferred stock and stockholders' equity	$ 101,587		$ 210,298