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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Cash flows from operating activities:      
Net income $ 152,862 $ 121,739 $ 106,273
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 13,950 13,843 13,747
Amortization of intangibles 11,037 11,135 10,262
Impairment charges 13,525   3,466
Deferred income tax benefit (9,904) (3,442) (2,839)
(Gain)/Loss on disposition of property, plant & equipment (47) (209) 71
Stock-based compensation 2,816 688 2,707
Excess tax benefits from stock-based awards (740) (101) (516)
Gain on involuntary conversion of discontinued operations assets     (2,190)
Changes in assets and liabilities (excluding acquisitions and disposition):      
Accounts receivable (46,615) (62,592) 14,648
Inventories (37,037) (1,585) (17,448)
Notes receivable   7,062 2,424
Prepaid expenses and other (1,127) (1,181) (3,118)
Accounts payable 15,449 23,435 (15,403)
Accrued liabilities 32,318 8,185 (3,275)
Other liabilities (1,421) 1,864 5,993
Net cash provided by operating activities 145,066 118,841 114,802
Cash flows from investing activities:      
Purchases of property, plant & equipment (24,305) (10,063) (33,749)
Proceeds from dispositions of property, plant & equipment 361 629 690
Proceeds from dispositions of investments 800 650 3,700
Proceeds from notes receivable 7,000 500  
Insurance proceeds from involuntary conversion of discontinued operations assets     2,569
Acquisitions (10,718) (170) (99,562)
Net proceeds from disposition of ambulance net assets 12,051    
Other 815 600  
Net cash used in investing activities (13,996) (7,854) (126,352)
Cash flows from financing activities:      
Cash dividends (38,162) (32,322) (22,329)
Special cash dividend (79,525)    
Purchase of treasury stock   (77,000)  
Shares repurchased related to cashless exercise of stock options (2,009)    
Excess tax benefits from stock-based awards 740 101 516
Proceeds from issuance of common stock 5,845 1,441 1,047
Net cash used in financing activities (113,111) (107,780) (20,766)
Net increase (decrease) in cash and cash equivalents 17,959 3,207 (32,316)
Cash and cash equivalents, beginning of year 218,642 215,435 247,751
Cash and cash equivalents, end of year 236,601 218,642 215,435
Supplemental cash flow information:      
Income taxes paid 75,561 61,549 57,789
Interest paid 411 560 212
Non-cash transactions:      
Capital expenditures in accounts payable 736 851 472
Common stock issued in business acquisition     $ 90,531