Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 01, 2021	Jan. 01, 2021
Current assets:
Cash and cash equivalents	$ 229,785	$ 197,525
Short-term investments	24,998	45,001
Accounts receivable, net of allowance for contract losses and doubtful accounts of $4,815 and $3,995 at October 1, 2021 and January 1, 2021, respectively	144,039	111,565
Prepaid expenses and other current assets	18,738	12,741
Total current assets	417,560	366,832
Property, equipment and leasehold improvements, net	60,082	59,823
Operating lease right-of-use assets	15,777	19,322
Goodwill	8,607	8,607
Deferred income taxes	42,561	40,539
Deferred compensation plan assets	92,048	83,731
Other assets	1,670	1,242
Total assets	638,305	580,096
Current liabilities:
Accounts payable and accrued liabilities	21,443	16,327
Accrued payroll and employee benefits	87,179	83,194
Deferred revenues	12,192	11,800
Operating lease liabilities	5,604	5,987
Total current liabilities	126,418	117,308
Other liabilities	3,078	2,986
Deferred compensation plan liabilities	93,111	83,961
Operating lease liabilities	10,709	14,343
Total liabilities	233,316	218,598
Stockholders’ equity:
Common stock, $0.001 par value; 120,000 shares authorized; 65,707 shares issued at October 1, 2021 and January 1, 2021	66	66
Additional paid-in capital	279,250	265,328
Accumulated other comprehensive income (loss)
Investment securities, available-for-sale		65
Foreign currency translation adjustments	(2,052)	(1,997)
Accumulated other comprehensive income (loss)	(2,052)	(1,932)
Retained earnings	468,578	421,809
Treasury stock, at cost; 13,595 and 13,903 shares held at October 1, 2021 and January 1, 2021, respectively	(340,853)	(323,773)
Total stockholders’ equity	404,989	361,498
Total liabilities and stockholders’ equity	$ 638,305	$ 580,096