Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Cash flows from operating activities:
Net income	$ 9,883,000	$ 11,294,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, plant and equipment	5,372,000	5,700,000
Amortization of intangible assets with finite lives	10,435,000	8,577,000
Amortization of stock-based compensation	2,117,000	2,237,000
Amortization of deferred financing costs	369,000	732,000
Write-off of deferred financing costs	(32,000)	3,886,000
Settlement of intellectual property litigation	0	3,217,000
Settlement of intellectual property litigation	0	(3,204,000)
Loss on disposal of property, plant and equipment	(2,067,000)	0
(Benefit from) provision for allowance for doubtful accounts	17,000	40,000
Provision for excess and obsolete inventory	(626,000)	487,000
Deferred income tax expense	932,000	1,749,000
Deferred income tax expense	2,912,000	2,594,000
Changes in assets and liabilities, net of effects of business acquisitions:
Accounts receivable	(220,000)	3,229,000
Inventories	98,000	(14,068,000)
Prepaid expenses and other current assets	(2,049,000)	1,568,000
Other assets	(197,000)	107,000
Accounts payable	2,270,000	(14,693,000)
Accrued expenses and other current liabilities	3,418,000	3,282,000
Contract liabilities	2,119,000	(857,000)
Other liabilities, non-current	32,000	275,000
Interest payable	(245,000)	177,000
Income taxes payable	(3,271,000)	(3,291,000)
Net cash provided by operating activities	31,267,000	13,038,000
Cash flows from investing activities:
Payment for acquisition of CGC, net of cash acquired	(11,165,000)	0
Purchases of property, plant and equipment	(2,508,000)	(4,181,000)
Net cash used in investing activities	(13,673,000)	(4,181,000)
Cash flows from financing activities:
Net (payments) borrowings of long-term debt under Credit Facility	(7,000,000)	174,500,000
Net payments under Revolving Loan portion of Prior Credit Facility	0	(48,603,000)
Repayment of debt under Term Loan portion of Prior Credit Facility	0	(120,121,000)
Remittance of employees' statutory tax withholdings for stock awards	(5,246,000)	(5,021,000)
Cash dividends paid	(5,120,000)	(4,998,000)
Payment of deferred financing costs	0	(1,808,000)
Repayment of principal amounts under finance lease and other obligations	(311,000)	(863,000)
Proceeds from issuance of employee stock purchase plan shares	510,000	476,000
Payment of shelf registration costs	0	(80,000)
Proceeds from exercises of stock options	468,000	174,000
Net cash used in financing activities	(16,699,000)	(6,344,000)
Net increase in cash and cash equivalents	895,000	2,513,000
Cash and cash equivalents at beginning of period	45,576,000	43,484,000
Cash and cash equivalents at end of period	46,471,000	45,997,000
Cash paid during the period for:
Interest	3,202,000	3,844,000
Income taxes, net	2,624,000	941,000
Non-cash investing and financing activities:
Reclass of finance lease right-of-use assets to property, plant and equipment	698,000	0
Cash dividends declared but unpaid (including dividend equivalents)	2,545,000	2,548,000
Accrued additions to property, plant and equipment	787,000	963,000
Common stock issued for acquisition of CGC	11,575,000	0
Deferred payment of CGC purchase price	750,000	0
Accrued deferred financing costs	0	4,000
Accrued shelf registration costs	0	68,000
Issuance of restricted stock, net of forfeiture	$ 1,000	$ 1,000