DEBT - Net Carrying Value of the Notes (Detail) - USD ($)		3 Months Ended	6 Months Ended
	Dec. 15, 2017	Jan. 31, 2020	Jan. 31, 2020	Jul. 31, 2019	Feb. 28, 2019
Interest Expense, Debt [Line Items]
Line of credit, current		$ 6,000,000	$ 6,000,000	$ 6,000,000
Carrying amount of equity component		$ 8,200,000	$ 8,200,000	8,200,000
Debt instrument, interest rate, effective percentage		18.47%	18.47%
Unused line of credit fee		0.50%	0.50%
Term Loan
Interest Expense, Debt [Line Items]
Principal amount outstanding		$ 387,065,000	$ 387,065,000	390,065,000
Unamortized debt discount		(753,000)	(753,000)	(888,000)
Net carrying value of the term loan		379,634,000	379,634,000	381,669,000
Convertible Senior Note
Interest Expense, Debt [Line Items]
Principal amount outstanding		14,940,000	14,940,000	14,940,000
SPHG Holdings
Interest Expense, Debt [Line Items]
Debt instrument, interest expense		701,000	1,390,000
SPHG Holdings | Coupon Interest
Interest Expense, Debt [Line Items]
Debt instrument, interest expense		280,000	560,000
SPHG Holdings | Accretion
Interest Expense, Debt [Line Items]
Debt instrument, interest expense		421,000	830,000
SPHG Holdings | Convertible Senior Note
Interest Expense, Debt [Line Items]
Net carrying value of the term loan		8,262,000	8,262,000	7,432,000
SPHG Holdings | 7.50% Convertible Senior Debt
Interest Expense, Debt [Line Items]
Principal amount		14,940,000	14,940,000	14,940,000	$ 14,940,000
Cerberus Credit Facility
Interest Expense, Debt [Line Items]
Principal amount outstanding		372,125,000	372,125,000	375,125,000
Line of credit facility, term	5 years
Credit facility, readily available borrowing capacity		19,000,000	19,000,000
Cerberus Credit Facility | Line of Credit
Interest Expense, Debt [Line Items]
Line of credit, current		6,000,000	6,000,000	6,000,000
Line of credit facility, maximum credit commitment		19,000,000	19,000,000
Cerberus Credit Facility | Term Loan
Interest Expense, Debt [Line Items]
Principal amount outstanding		372,125,000	372,125,000	375,125,000
Unamortized debt discount		(753,000)	(753,000)	(888,000)
Net carrying value of the term loan		$ 371,372,000	371,372,000	$ 374,237,000
MidCap Credit Facility
Interest Expense, Debt [Line Items]
Debt instrument, percentage points added to the reference rate		4.00%
Line of credit facility, term		3 years
Line of credit facility, maximum credit commitment		$ 12,500,000.0	12,500,000.0
Credit facility, readily available borrowing capacity		6,817,000	6,817,000
MidCap Credit Facility | Letter Of Credit Sublimit
Interest Expense, Debt [Line Items]
Line of credit facility, maximum credit commitment		5,000,000.0	5,000,000.0
MidCap Credit Facility | Inventory Sublimit
Interest Expense, Debt [Line Items]
Line of credit facility, maximum credit commitment		$ 4,500,000.0	$ 4,500,000.0