Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Cash flows from operating activities:
Net income	$ 5,305,000	$ 7,435,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization of property, plant and equipment	1,710,000	2,025,000
Amortization of intangible assets with finite lives	1,582,000	1,582,000
Amortization of stock-based compensation	947,000	745,000
Deferred financing costs	357,000	352,000
Change in fair value of contingent earn-out liability	(239,000)	(2,378,000)
Loss on disposal of property, plant and equipment	30,000	9,000
Provision for allowance for doubtful accounts	104,000	211,000
Provision for excess and obsolete inventory	702,000	671,000
Deferred income tax (benefit) expense	(999,000)	1,058,000
Changes in assets and liabilities:
Accounts receivable	(12,209,000)	9,104,000
Inventories	(4,111,000)	3,042,000
Prepaid expenses and other current assets	306,000	198,000
Other assets	(3,000)	(40,000)
Accounts payable	(1,279,000)	(6,757,000)
Accrued expenses and other current liabilities	(3,355,000)	(7,273,000)
Customer advances and deposits	4,746,000	(2,586,000)
Other liabilities	75,000	518,000
Interest payable	1,500,000	1,500,000
Income taxes payable	3,591,000	2,462,000
Net cash (used in) provided by operating activities	(1,240,000)	11,878,000
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,027,000)	(1,063,000)
Net cash used in investing activities	(1,027,000)	(1,063,000)
Cash flows from financing activities:
Repurchases of common stock	(3,585,000)	0
Cash dividends paid	(4,524,000)	(4,773,000)
Proceeds from exercises of stock options	79,000	323,000
Proceeds from issuance of employee stock purchase plan shares	214,000	248,000
Payment of contingent consideration related to business acquisition	(6,000)	(1,000)
Net cash used in financing activities	(7,822,000)	(4,203,000)
Net (decrease) increase in cash and cash equivalents	(10,089,000)	6,612,000
Cash and cash equivalents at beginning of period	356,642,000	367,894,000
Cash and cash equivalents at end of period	346,553,000	374,506,000
Cash paid during the period for:
Interest	90,000	87,000
Income taxes	456,000	570,000
Non-cash investing and financing activities:
Cash dividends declared (including accrual of dividend equivalents)	4,555,000	4,784,000
Equity-classified stock awards issued	$ 139,000	$ 0