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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:      
Net income $ 392,084 $ 236,411 $ 192,124
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 25,592 30,367 31,612
Share-based compensation 112,457 93,681 82,973
Deferred income taxes (5,955) (8,639) 7,701
Non-cash operating lease costs 16,102 20,011  
Impairment loss on operating lease assets 0 28,016  
Provision of doubtful accounts 652 3,199 518
Net gain (loss) on marketable securities (4,569) (2,071) 761
Net loss on sales and abandonment of property and equipment 333 5,249 127
Gains on product line asset sales and business divestiture (100,139) 0 0
Changes in operating assets and liabilities:      
Accounts receivable 24,496 (59,889) (36,176)
Prepaid expenses and other assets (5,722) (960) (55,507)
Accounts payable (2,354) 1,059 1,885
Accrued compensation and employee benefits (13,144) 12,065 22,380
Other liabilities (20,502) 693 1,463
Deferred revenue 4,486 5,724 10,489
Net cash provided by operating activities 423,817 364,916 260,350
Cash flows from investing activities:      
Purchases of property and equipment (7,569) (21,989) (23,981)
Proceeds from sales of marketable securities 7,237 3,470 3,480
Purchases of marketable securities (9,039) (6,119) (6,404)
Proceeds from Sale of Productive Assets 147,431 0 0
Distribution from (purchase of) equity investment (210) 55 0
Cash paid for acquisitions, net of cash acquired 0 0 (15,855)
Net cash provided by (used in) investing activities 137,850 (24,583) (42,760)
Cash flows from financing activities:      
Proceeds from revolving line of credit 682,000 263,000 229,000
Payments on revolving line of credit (259,000) (513,000) (141,000)
Proceeds from issuance of senior notes 0 350,000 0
Payments on senior notes 0 (85,000) (28,000)
Payments on debt issuance costs (1,488) (6,840) 0
Payments on finance leases (176) (1,716) (945)
Proceeds from issuance of treasury stock under employee stock plans 20,881 42,258 22,788
Taxes paid related to net share settlement of equity awards (91,609) (102,903) (52,996)
Repurchases of common stock (874,179) (235,223) (228,894)
Net cash used in financing activities (523,571) (289,424) (200,047)
Effect of exchange rate changes on cash (136) 59 (1,140)
Increase in cash and cash equivalents 37,960 50,968 16,403
Cash and cash equivalents, beginning of year 157,394 106,426 90,023
Cash and cash equivalents, end of year 195,354 157,394 106,426
Supplemental disclosures of cash flow information:      
Cash paid for income taxes, refunds 464 1,931 1,372
Income Taxes Paid, Net 71,486 10,152 18,779
Cash paid for interest 37,955 37,735 39,924
Supplemental disclosures of non-cash investing and financing activities:      
Finance lease obligation incurred 0 1,387 5,803
Unsettled repurchases of common stock 8,043 0 0
Purchase of property and equipment included in accounts payable $ 71 $ 166 $ 1,448