CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 97,643	$ 84,959
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,280	5,227
Share-based compensation	29,702	29,878
Deferred income taxes	(8,507)	3,905
Net loss on marketable securities	348	592
Non-cash operating lease costs	3,779	4,115
Provision for doubtful accounts	369	325
Gain (Loss) on Disposition of Assets	1,941	0
Net loss on sales and abandonment of property and equipment	16	51
Changes in operating assets and liabilities:
Accounts receivable	8,704	58,428
Prepaid expenses and other assets	(5,823)	157
Accounts payable	168	(268)
Accrued compensation and employee benefits	(37,883)	(40,335)
Other liabilities	(7,955)	(14,904)
Deferred revenue	9,540	(7,249)
Net cash provided by operating activities	92,440	124,881
Cash flows from investing activities:
Purchases of property and equipment	(850)	(895)
Proceeds from sales of marketable securities	2,393	129
Purchases of marketable securities	(4,558)	(2,763)
Proceeds from product line asset sales, net of cash transferred	(7,575)	2,257
Net cash used in investing activities	(10,590)	(1,272)
Cash flows from financing activities:
Proceeds from revolving line of credit and term loan	169,000	620,000
Payments on revolving line of credit and term loan	(102,750)	(788,000)
Proceeds from issuance of senior notes	0	550,000
Payments on debt issuance costs	0	(8,200)
Proceeds from issuance of treasury stock under employee stock plans	1,995	550
Taxes paid related to net share settlement of equity awards	(72,865)	(47,024)
Repurchases of common stock	(75,004)	(482,755)
Net cash used in financing activities	(79,624)	(155,429)
Effect of exchange rate changes on cash	4,428	(1,377)
Increase (decrease) in cash and cash equivalents	6,654	(33,197)
Cash and cash equivalents, beginning of period	133,202	195,354
Cash and cash equivalents, end of period	139,856	162,157
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds of $8 and $72 during the quarters ended December 31, 2022 and 2021, respectively	13,412	1,570
Cash paid for interest	37,730	19,396
Supplemental disclosures of non-cash investing and financing activities:
Purchase of property and equipment included in accounts payable	37	67
Unsettled repurchases of common stock	$ 0	$ 18,870