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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
OPERATING ACTIVITIES      
Net income $ 86,115 $ 21,010 $ 13,444
Adjustments to reconcile net income to net cash provided by operating activities:      
Net loss from discontinued operations 4,634
Depreciation and amortization $ 18,418 $ 16,318 14,910
Impairment of building and improvements   4,359
Deferred income taxes $ 5,877 2,487 15,198
Provision for doubtful accounts receivable 97 $ 500 $ 2,743
Gain on sale of interest in Fabrix Systems Ltd. (76,864)  
Net realized loss (gains) from marketable securities and investments $ 54 $ (586)
Gain on proceeds from insurance $ (571)
Interest in the equity of investments $ (1,699) (1,282) $ (1,968)
Stock-based compensation 5,185 5,382 5,875
Change in assets and liabilities:      
Restricted cash and cash equivalents (28,286) (25,292) (23,006)
Trade accounts receivable 640 (1,363) 17,606
Prepaid expenses, other current assets and other assets 2,122 (4,628) 2,890
Trade accounts payable, accrued expenses, other current liabilities and other liabilities (3,824) (5,914) (22,578)
Customer deposits 25,939 30,186 17,998
Income taxes payable (301) (29) (576)
Deferred revenue (2,939) 8,917 6,253
Net cash provided by operating activities 30,534 45,721 57,196
INVESTING ACTIVITIES      
Capital expenditures (28,556) $ (17,021) $ (14,537)
Proceeds from sale of interest in Fabrix Systems Ltd., net of cash and cash equivalents sold $ 59,678
Deposit on purchase of leasehold interest in building $ (950)
Collection of notes receivable, net 750
Cash used for acquisition and purchase of investments $ (125) $ (175) (1,219)
Proceeds from sales and redemptions of investments $ 119 1,038 114
Purchases of other intangibles (250) $ (93)
Proceeds from sale of building 250
Proceeds from insurance 571  
Purchases of marketable securities $ (52,360) (20,658) $ (11,414)
Proceeds from maturities and sales of marketable securities 24,126 17,323 1,712
Net cash provided by (used in) investing activities 2,882 $ (18,922) (25,637)
FINANCING ACTIVITIES      
Cash of Straight Path Communications, Inc. deconsolidated as a result of spin-off   (15,000)
Dividends paid (47,594) $ (13,635) (17,123)
Distributions to noncontrolling interests $ (2,050) (1,888) (2,245)
Purchases of stock of subsidiary $ (1,133) (1,804)
Proceeds from sales of stock and exercise of stock options of subsidiary 154
Proceeds from exercise of stock options $ 3,424 $ 609 921
Proceeds from revolving credit loan payable 56,000 21,062
Repayments of revolving credit loan payable and other borrowings $ (13,271) (64,318) (21,304)
Purchase of Class B common stock from Howard S. Jonas (7,500)    
Repurchases of Class B common stock (3,202) (1,005) (1,079)
Net cash used in financing activities $ (70,193) $ (25,370) (36,418)
DISCONTINUED OPERATIONS      
Net cash used in operating activities (2,638)
Net cash used in investing activities (350)
Net cash used in discontinued operations (2,988)
Effect of exchange rate changes on cash and cash equivalents $ (6,685) $ 794 1,241
Net (decrease) increase in cash and cash equivalents (43,462) 2,223 (6,606)
Cash and cash equivalents at beginning of year 153,823 151,600 158,206
Cash and cash equivalents at end of year 110,361 153,823 151,600
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION      
Cash payments made for interest 745 743 1,286
Cash payments made for income taxes 320 $ 1,115 $ 483
SUPPLEMENTAL SCHEDULE OF NON-CASH FINANCING AND INVESTING ACTIVITIES      
Net liabilities excluding cash and cash equivalents of Fabrix Systems Ltd. sold $ 14,333
Adjustment to liabilities in connection with the Straight Path Communications, Inc. spin-off $ 1,624
Escrow account balances included in other current assets used to reduce notes payable $ 1,976
Net liabilities excluding cash and cash equivalents of Straight Path Communications, Inc. deconsolidated as a result of spin-off $ 1,341