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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		6 Months Ended
	Jan. 29, 2020	Mar. 31, 2020	Mar. 31, 2019	Nov. 30, 2019	Sep. 30, 2019	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for repurchases of common stock		$ 13,346	$ 39,049
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements		$ 15,590
Forfeiture rate, Board of Directors		0.00%
Forfeiture rate, non-Board of Directors		9.00%
Unrecognized compensation cost is expected to be recognized over a weighted-average period		2 years 2 months 12 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested contractual term, in years		10 years
Vesting period, in years		4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years		2 years
2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available for future grants	1,000
Share-based Payment Arrangement, Tranche One [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		25.00%
Share-based Payment Arrangement, Tranche One [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		50.00%
2017 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase period in years		3 years
Shares of common stock repurchased			456
Payments for repurchases of common stock			$ 43,253
2017 Authorization [Member] \| 2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grants		2,185			1,783
2019 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase period in years		3 years
Shares of common stock repurchased		124
Payments for repurchases of common stock		$ 13,346
Maximum [Member] \| 2017 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount						$ 500,000
Maximum [Member] \| 2019 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount				$ 500,000