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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Cash flows from operating activities:      
Net income $ 179,002 $ 152,862 $ 121,739
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 12,850 13,950 13,843
Amortization of intangibles 12,984 11,037 11,135
Impairment charges 710 13,525  
Deferred income tax benefit (2,177) (9,904) (3,442)
Gain on disposal of bus business (7,079)    
Gain on disposition of property, plant & equipment (1,897) (47) (209)
Stock-based compensation 5,231 2,816 688
Excess tax benefits from stock-based awards (960) (740) (101)
Changes in assets and liabilities (excluding acquisitions and disposition):      
Accounts receivable (9,448) (46,615) (62,592)
Inventories (44,774) (37,037) (1,585)
Notes receivable     7,062
Prepaid expenses and other assets (2,183) (1,127) (1,181)
Accounts payable 13,647 15,449 23,435
Accrued liabilities 7,706 32,318 8,185
Long-term liabilities and other (14,351) (1,421) 1,864
Net cash provided by operating activities 149,261 145,066 118,841
Cash flows from investing activities:      
Purchases of property, plant & equipment (30,406) (24,305) (10,063)
Proceeds from dispositions of property, plant & equipment 8,699 361 629
Proceeds from dispositions of investments 700 800 650
Proceeds from notes receivable 6,425 7,000 500
Proceeds from sale of bus business 105,043    
Acquisitions, net of cash acquired (86,092) (10,718) (170)
Proceeds from disposition of ambulance net assets   12,051  
Other (1,441) 815 600
Net cash provided by (used in) investing activities 2,928 (13,996) (7,854)
Cash flows from financing activities:      
Cash dividends (49,024) (38,162) (32,322)
Special cash dividends (53,290) (79,525)  
Purchase of treasury stock     (77,000)
Shares repurchased related to cashless exercise of stock options   (2,009)  
Payments related to vesting of stock-based awards (1,306)    
Excess tax benefits from stock-based awards 960 740 101
Proceeds from issuance of common stock 3,206 5,845 1,441
Net cash used in financing activities (99,454) (113,111) (107,780)
Net increase in cash and cash equivalents 52,735 17,959 3,207
Cash and cash equivalents, beginning of year 236,601 218,642 215,435
Cash and cash equivalents, end of year 289,336 236,601 218,642
Supplemental cash flow information:      
Income taxes paid 97,561 75,561 61,549
Interest paid 134 411 560
Non-cash transactions:      
Capital expenditures in accounts payable $ 768 $ 736 $ 851