CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 85,459	$ 32,358	$ 34,704
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Stock compensation expense	4,460	4,455	3,958
Right-of-use asset amortization	3,755	1,906	2,554
Depreciation	1,905	2,013	2,983
Changes in accrued interest on investments	1,237	(3,899)	(1,735)
Deferred income tax expense (benefit)	1,865	1,333	(3,232)
Equity in loss (income) of solar energy investments	150	130	(1,113)
Other	869	590	831
Changes in operating assets and liabilities
Accounts receivable	(128,608)	2,764	(23,246)
Contract assets	19,759	(23,411)	(19,874)
Other assets	(7,681)	(1,004)	(3,346)
Accounts payable and accrued expenses	66,227	14,830	9,084
Contract liabilities	118,187	84,793	(31,629)
Net cash provided by (used in) operating activities	167,584	116,858	(30,061)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(175,000)	(115,000)	(249,750)
Maturities of short-term investments	130,000	159,750	190,000
Purchases of available-for-sale securities	(139,922)	(104,492)
Maturities of available-for-sale securities	19,230
Purchases of property, plant and equipment	(6,583)	(2,756)	(3,372)
Issuance of note receivable	(5,023)
Investments in solar energy projects	(16,317)	(5,109)
Net cash used in investing activities	(193,615)	(67,607)	(63,122)
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(1,524)	(12,464)	(68,236)
Payments of cash dividends	(18,268)	(14,683)	(13,956)
Distribution to non-controlling interest			(677)
Settlements of share-based awards, net of withholding taxes paid	(6,268)	1,097	66
Net cash used in financing activities	(26,060)	(26,050)	(82,803)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	322	(116)	(539)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(51,769)	23,085	(176,525)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	197,032	173,947	350,472
CASH AND CASH EQUIVALENTS, END OF PERIOD	145,263	197,032	173,947
NON-CASH INVESTING AND FINANCING ACTIVITIES
Investments in solar energy projects not yet paid	11,519	3,312
Right-of-use assets obtained in exchange for lease obligations	3,746	2,444	3,678
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes, net of refunds	30,827	14,297	6,665
Cash paid for operating leases	$ 3,754	$ 1,910	$ 2,552