Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Cash flows from operating activities:
Net income	$ 14,101,000	$ 4,096,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, plant and equipment	6,663,000	7,317,000
Amortization of intangible assets with finite lives	10,537,000	12,087,000
Amortization of stock-based compensation	1,827,000	1,989,000
Amortization of deferred financing costs	1,098,000	968,000
Settlement of intellectual property litigation	0	(9,979,000)
Gain on disposal of property, plant and equipment	0	(146,000)
Provision for allowance for doubtful accounts	577,000	433,000
Provision for excess and obsolete inventory	2,433,000	1,061,000
Excess income tax benefit from stock-based awards	0	(61,000)
Deferred income tax (benefit) expense	(11,218,000)	4,307,000
Changes in assets and liabilities:
Accounts receivable	5,801,000	24,989,000
Inventories	(13,537,000)	(875,000)
Prepaid expenses and other current assets	1,745,000	409,000
Other assets	(257,000)	201,000
Accounts payable	(2,259,000)	(8,572,000)
Accrued expenses and other current liabilities	(5,146,000)	(3,882,000)
Customer advances and deposits	235,000	(2,989,000)
Other liabilities, non-current	(242,000)	(749,000)
Interest payable	(199,000)	(471,000)
Income taxes payable	(2,982,000)	(4,525,000)
Net cash provided by operating activities	9,177,000	25,608,000
Cash flows from investing activities:
Purchases of property, plant and equipment	(2,836,000)	(4,147,000)
Net cash used in investing activities	(2,836,000)	(4,147,000)
Cash flows from financing activities:
Net borrowings (repayments) under Revolving Loan Facility	9,400,000	(4,100,000)
Repayment of long-term debt under Term Loan Facility	(10,354,000)	(4,427,000)
Cash dividends paid	(4,821,000)	(14,177,000)
Remittance of employees' statutory tax withholdings for stock awards	(998,000)	(244,000)
Repayment of principal amounts under capital lease obligations	(1,337,000)	(1,853,000)
Proceeds from issuance of employee stock purchase plan shares	397,000	348,000
Payment of issuance costs related to equity offering	0	(626,000)
Payment of deferred financing costs	0	(104,000)
Excess income tax benefit from stock-based awards	0	61,000
Net cash used in financing activities	(7,713,000)	(25,122,000)
Net decrease in cash and cash equivalents	(1,372,000)	(3,661,000)
Cash and cash equivalents at beginning of period	41,844,000	66,805,000
Cash and cash equivalents at end of period	40,472,000	63,144,000
Cash paid during the period for:
Interest	3,977,000	5,538,000
Income taxes, net	108,000	2,143,000
Non-cash investing and financing activities:
Cash dividends declared but unpaid (including dividend equivalents)	2,506,000	2,522,000
Accrued additions to property, plant and equipment	1,102,000	1,147,000
(Forfeiture) issuance of restricted stock	$ (1,000)	$ 15,000