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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 91,935 $ 88,212
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 22,329 27,427
Share-based compensation 54,631 43,546
Deferred income taxes 6,749 (2)
Net gain on marketable securities (635) 0
Provision for doubtful accounts, net 541 1,388
Net loss on sales of property and equipment 28 26
Changes in operating assets and liabilities:    
Accounts receivable (15,571) 25,605
Prepaid expenses and other assets (3,056) (26,171)
Accounts payable 2,623 (5,432)
Accrued compensation and employee benefits (1,977) (8,317)
Other liabilities 55 5,838
Deferred revenue 5,437 19,303
Net cash provided by operating activities 163,089 171,423
Cash flows from investing activities:    
Purchases of property and equipment (24,220) (14,792)
Proceeds from sales of marketable securities 3,005 0
Purchases of marketable securities (5,509) 0
Purchase of cost method investees 0 (777)
Net cash used in investing activities (26,724) (15,569)
Cash flows from financing activities:    
Proceeds from revolving line of credit 371,000 98,000
Payments on revolving line of credit (480,000) (57,000)
Proceeds from issuance of senior notes 400,000 0
Payments on senior notes (131,000) 0
Payments on debt issuance costs (7,869) 0
Proceeds from issuance of treasury stock under employee stock plans 2,492 13,112
Taxes paid related to net share settlement of equity awards (42,872) (39,324)
Dividends paid 0 (1,238)
Repurchases of common stock (229,540) (116,341)
Net cash used in financing activities (117,789) (102,791)
Effect of exchange rate changes on cash (4,265) 1,678
Increase in cash and cash equivalents 14,311 54,741
Cash and cash equivalents, beginning of period 105,618 75,926
Cash and cash equivalents, end of period 119,929 130,667
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net of refunds 9,975 22,726
Cash paid for interest 20,501 18,847
Supplemental disclosures of non-cash investing and financing activities:    
Purchase of property and equipment included in accounts payable 5,282 2,470
Unsettled repurchases of common stock $ 7,601 $ 4,177