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Condensed Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Cash flows from operating activities:    
Net income $ 11,288,000 $ 9,800,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, plant and equipment 3,383,000 4,019,000
Amortization of intangible assets with finite lives 3,164,000 3,164,000
Amortization of stock-based compensation 2,016,000 1,551,000
Deferred financing costs 697,000 706,000
Change in fair value of contingent earn-out liability (239,000) (3,267,000)
Loss on disposal of property, plant and equipment 42,000 32,000
Provision for (benefit from) allowance for doubtful accounts 92,000 (107,000)
Provision for excess and obsolete inventory 1,485,000 1,276,000
Excess income tax benefit from stock-based award exercises (16,000) (19,000)
Deferred income tax (benefit) expense (1,689,000) 1,029,000
Changes in assets and liabilities:    
Accounts receivable (7,056,000) 14,113,000
Inventories (5,939,000) 905,000
Prepaid expenses and other current assets (4,308,000) (740,000)
Other assets 6,000 15,000
Accounts payable 210,000 (6,899,000)
Accrued expenses and other current liabilities (3,574,000) (8,645,000)
Customer advances and deposits 409,000 (3,986,000)
Other liabilities 149,000 588,000
Income taxes payable (66,000) (2,141,000)
Net cash provided by operating activities 54,000 11,394,000
Cash flows from investing activities:    
Purchases of property, plant and equipment (3,424,000) (2,457,000)
Net cash used in investing activities (3,424,000) (2,457,000)
Cash flows from financing activities:    
Repurchases of common stock (29,107,000) (10,477,000)
Cash dividends paid (9,053,000) (14,335,000)
Proceeds from exercises of stock options 2,559,000 446,000
Proceeds from issuance of employee stock purchase plan shares 430,000 478,000
Excess income tax benefit from stock-based award exercises 16,000 19,000
Payment of contingent consideration related to business acquisition (49,000) (10,000)
Fees related to line of credit (75,000) (25,000)
Net cash used in financing activities (35,279,000) (23,904,000)
Net decrease in cash and cash equivalents (38,649,000) (14,967,000)
Cash and cash equivalents at beginning of period 356,642,000 367,894,000
Cash and cash equivalents at end of period 317,993,000 352,927,000
Cash paid during the period for:    
Interest 3,178,000 3,177,000
Income taxes 8,224,000 7,070,000
Non-cash investing and financing activities:    
Cash dividends declared (including accrual of dividend equivalents) 4,789,000 0
Equity-classified stock awards issued $ 139,000 $ 0