Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 8,513,000	$ (10,440,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of property, plant and equipment	10,849,000	6,078,000
Amortization of intangible assets with finite lives	17,555,000	7,348,000
Amortization of stock-based compensation	2,980,000	3,166,000
Amortization of deferred financing costs	1,450,000	292,000
Settlement of intellectual property litigation	(12,020,000)	0
Gain on disposal of property, plant and equipment	(147,000)	(15,000)
Provision for allowance for doubtful accounts	454,000	670,000
Provision for excess and obsolete inventory	1,758,000	2,022,000
Excess income tax benefit from stock-based award exercises	(78,000)	(23,000)
Deferred income tax expense (benefit)	6,606,000	(516,000)
Changes in assets and liabilities, net of effects of business acquisition:
Accounts receivable	30,065,000	23,057,000
Inventories	2,259,000	5,068,000
Prepaid expenses and other current assets	(1,532,000)	1,877,000
Other assets	230,000	(306,000)
Accounts payable	(6,088,000)	(9,846,000)
Accrued expenses and other current liabilities	(16,832,000)	(4,013,000)
Customer advances and deposits	3,961,000	(5,910,000)
Other liabilities, non-current	(1,042,000)	(882,000)
Interest payable	(1,226,000)	82,000
Income taxes payable	(4,038,000)	(5,436,000)
Net cash provided by operating activities	43,677,000	12,273,000
Cash flows from investing activities:
Payments for business acquisition, net of cash acquired	0	280,535,000
Purchases of property, plant and equipment	(6,223,000)	(3,063,000)
Net cash used in investing activities	(6,223,000)	(283,598,000)
Cash flows from financing activities:
Net (payments) borrowings under Revolving Loan Facility	(18,300,000)	101,905,000
Cash dividends paid	(16,518,000)	(14,540,000)
Repayment of long-term debt under Term Loan Facility	(7,747,000)	(3,125,000)
Repayment of principal amounts under capital lease obligations	(2,739,000)	(717,000)
Payment of issuance costs related to equity offering	(626,000)	(337,000)
Payment of deferred financing costs	(104,000)	(10,123,000)
Proceeds from issuance of employee stock purchase plan shares	514,000	499,000
Excess income tax benefit from stock-based award exercises	78,000	23,000
Borrowing of long-term debt under Term Loan Facility	0	250,000,000
Required payments for debt assumed for business acquisition	0	(134,101,000)
Net cash (used in) provided by financing activities	(45,442,000)	189,484,000
Net decrease in cash and cash equivalents	(7,988,000)	(81,841,000)
Cash and cash equivalents at beginning of period	66,805,000	150,953,000
Cash and cash equivalents at end of period	58,817,000	69,112,000
Cash paid during the period for:
Interest	8,584,000	2,976,000
Income taxes, net	2,240,000	4,766,000
Non-cash investing and financing activities:
Cash dividends declared but unpaid (including accrual of dividend equivalents)	2,570,000	5,265,000
Accrued additions to property, plant and equipment	824,000	125,000
Issuance of restricted stock	14,000	0
Accrued deferred financing costs	0	139,000
Accrued shelf registration costs	$ 0	$ 20,000