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Condensed Consolidated Statements of Cash Flows (USD $)
 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Cash flows from operating activities:    
Net income $ 24,488,000 $ 56,007,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, plant and equipment 7,219,000 10,352,000
Amortization of intangible assets with finite lives 5,037,000 6,064,000
Amortization of stock-based compensation 2,718,000 3,977,000
Deferred financing costs 1,124,000 1,045,000
Change in fair value of contingent earn-out liability (844,000) 0
Loss (gain) on disposal of property, plant and equipment 7,000 (1,000)
(Benefit from) provision for allowance for doubtful accounts (14,000) 302,000
Provision for excess and obsolete inventory 2,176,000 1,507,000
Excess income tax benefit from stock-based award exercises (142,000) (154,000)
Deferred income tax (benefit) expense (3,843,000) 1,394,000
Changes in assets and liabilities, net of effects of acquisition:    
Accounts receivable (2,194,000) 65,353,000
Inventories (7,024,000) (9,407,000)
Prepaid expenses and other current assets (348,000) 1,154,000
Other assets (35,000) 702,000
Accounts payable (5,138,000) (60,016,000)
Accrued expenses and other current liabilities (7,011,000) (9,473,000)
Customer advances and deposits 6,140,000 3,478,000
Other liabilities 666,000 568,000
Interest payable 1,513,000 1,500,000
Income taxes payable (7,250,000) (5,421,000)
Net cash provided by operating activities 17,245,000 68,931,000
Cash flows from investing activities:    
Purchases of property, plant and equipment (4,467,000) (4,768,000)
Purchases of other intangibles with finite lives 0 (50,000)
Payments for business acquisitions 0 (2,850,000)
Net cash used in investing activities (4,467,000) (7,668,000)
Cash flows from financing activities:    
Repurchases of common stock (190,062,000) (68,071,000)
Cash dividends paid (17,554,000) (13,614,000)
Proceeds from exercises of stock options 3,127,000 1,305,000
Proceeds from issuance of employee stock purchase plan shares 825,000 857,000
Excess income tax benefit from stock-based award exercises 142,000 154,000
Payment of contingent consideration related to business acquisition (163,000) (8,000)
Fees related to line of credit (248,000) (539,000)
Net cash used in financing activities (203,933,000) (79,916,000)
Net decrease in cash and cash equivalents (191,155,000) (18,653,000)
Cash and cash equivalents at beginning of period 558,804,000 607,594,000
Cash and cash equivalents at end of period 367,649,000 588,941,000
Cash paid during the period for:    
Interest 3,333,000 3,309,000
Income taxes 18,364,000 31,150,000
Non cash investing and financing activities:    
Business acquisition liabilities 0 4,066,000
Cash dividends declared $ 5,071,000 $ 6,521,000