Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Cash flows from operating activities:
Net (loss) income	$ (10,440,000)	$ 17,770,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization of property, plant and equipment	6,078,000	4,896,000
Amortization of intangible assets with finite lives	7,348,000	4,682,000
Amortization of stock-based compensation	3,166,000	3,642,000
Amortization of deferred financing costs	292,000	65,000
(Gain) loss on disposal of property, plant and equipment	(15,000)	3,000
Provision for allowance for doubtful accounts	670,000	315,000
Provision for excess and obsolete inventory	2,022,000	1,962,000
Excess income tax benefit from stock-based award exercises	(23,000)	(140,000)
Deferred income tax benefit	(516,000)	(1,103,000)
Changes in assets and liabilities, net of effects of business acquisition:
Accounts receivable	23,057,000	(13,049,000)
Inventories	5,068,000	(8,729,000)
Prepaid expenses and other current assets	1,877,000	(225,000)
Other assets	(306,000)	(40,000)
Accounts payable	(9,846,000)	(3,882,000)
Accrued expenses and other current liabilities	(4,013,000)	(3,152,000)
Customer advances and deposits	(5,910,000)	5,063,000
Other liabilities, non-current	(882,000)	(608,000)
Interest payable	82,000	(29,000)
Income taxes payable	(5,436,000)	242,000
Net cash provided by operating activities	12,273,000	7,683,000
Cash flows from investing activities:
Payments for business acquisition, net of cash acquired	(280,535,000)	0
Purchases of property, plant and equipment	(3,063,000)	(2,833,000)
Net cash used in investing activities	(283,598,000)	(2,833,000)
Cash flows from financing activities:
Borrowings of debt	351,905,000	0
Required payments for debt assumed for business acquisition	(134,101,000)	0
Cash dividends paid	(14,540,000)	(14,581,000)
Payment of deferred financing costs	(10,123,000)	0
Repayment of long-term debt including capital lease obligations	(3,842,000)	0
Payment of shelf registration costs	(337,000)	0
Repurchases of common stock	0	(4,989,000)
Proceeds from exercises of stock options	0	1,417,000
Proceeds from issuance of employee stock purchase plan shares	499,000	707,000
Excess income tax benefit from stock-based award exercises	23,000	140,000
Net cash provided by (used in) financing activities	189,484,000	(17,306,000)
Net decrease in cash and cash equivalents	(81,841,000)	(12,456,000)
Cash and cash equivalents at beginning of period	150,953,000	154,500,000
Cash and cash equivalents at end of period	69,112,000	142,044,000
Cash paid during the period for:
Interest	2,976,000	117,000
Income taxes	4,766,000	8,970,000
Non-cash investing and financing activities:
Accrued fixed asset additions	125,000	0
Cash dividends declared but unpaid (including accrual of dividend equivalents)	5,265,000	5,115,000
Accrued deferred financing costs	139,000	0
Accrued shelf registration costs	$ 20,000	$ 0