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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Cash flows provided by (used in) operating activities:    
Net income $ 62,328 $ 33,616
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements 25,782 21,513
Share-based compensation costs 15,602 13,755
Amortization of intangible assets 9,687 8,947
Deferred taxes 10,788 5,037
Provision for inventory excess and obsolescence 6,699 4,673
Provision for warranty 7,898 3,891
Other 4,540 3,356
Changes in assets and liabilities:    
Accounts receivable 64,938 38,544
Inventories (4,481) (67,555)
Prepaid expenses and other (29,792) 1,133
Operating lease right-of-use assets 4,176  
Accounts payable, accruals and other obligations (142,229) (76,351)
Deferred revenue 8,926 (4,664)
Short and long-term operating lease liabilities (5,098)  
Net cash provided by (used in) operating activities 39,764 (14,105)
Cash flows provided by (used in) investing activities:    
Payments for equipment, furniture, fixtures and intellectual property (26,820) (15,345)
Purchase of available for sale securities (29,733) (68,516)
Proceeds from maturities of available for sale securities 30,000 60,000
Proceeds from sales of available for sale securities 0 98,265
Settlement of foreign currency forward contracts, net (73) (4,650)
Acquisition of business, net of cash acquired (28,300) 0
Purchase of equity investment 0 (333)
Net cash provided by (used in) investing activities (54,926) 69,421
Cash flows used in financing activities:    
Payment of long-term debt 0 (1,750)
Payment of debt issuance costs (382) 0
Payment of finance lease obligations (722)  
Payment of finance lease obligations   (758)
Payment for debt conversion liability 0 (111,268)
Shares repurchased for tax withholdings on vesting of stock unit awards (12,572) (10,026)
Repurchases of common stock - repurchase program (49,203) (19,721)
Proceeds from issuance of common stock 11,862 10,899
Net cash used in financing activities (51,017) (132,624)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (643) 695
Net decrease in cash, cash equivalents and restricted cash (66,822) (76,613)
Cash, cash equivalents and restricted cash at beginning of period 904,161 745,423
Cash, cash equivalents and restricted cash at end of period 837,339 668,810
Supplemental disclosure of cash flow information    
Cash paid during the period for interest 9,325 10,007
Cash paid during the period for income taxes, net 8,325 3,402
Operating lease payments 5,642  
Non-cash investing and financing activities    
Purchase of equipment in accounts payable 5,905 5,471
Repurchase of common stock in accrued liabilities from repurchase program 1,501 1,441
Conversion of debt conversion liability into 1,585,140 shares of common stock 0 $ 52,944
Operating lease right-of-use assets subject to lease liability $ 1,157