CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2026	Apr. 30, 2025
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 46,063	$ 22,550
Adjustments to reconcile net income to net cash provided by operating activities
Stock compensation expense	2,036	1,188
Depreciation	559	415
Changes in accrued interest on investments	(173)	1,265
Non-cash lease expense	1,624	1,173
Deferred income tax (benefit) expense	(869)	340
Other	113	(1,014)
Changes in operating assets and liabilities
Accounts receivable	2,869	69,309
Contract assets	6,480	(1,928)
Other assets	(14,625)	(2,934)
Accounts payable and accrued expenses	17,502	(39,623)
Contract liabilities	51,805	(15,448)
Net cash provided by operating activities	113,384	35,293
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(32,500)	(12,500)
Maturities of short-term investments	12,500	50,000
Purchases of available-for-sale securities	(60,047)	(27,189)
Maturities of available-for-sale securities	15,000	15,000
Purchases of property, plant and equipment	(2,433)	(395)
Net cash (used in) provided by investing activities	(67,480)	24,916
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(2,955)	(6,849)
Payments of cash dividends	(7,005)	(5,070)
Settlements of share-based awards, net of withholding taxes paid	(23,690)	(6,082)
Net cash used in financing activities	(33,650)	(18,001)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	4,112	1,780
NET INCREASE IN CASH AND CASH EQUIVALENTS	16,366	43,988
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	339,481	145,263
CASH AND CASH EQUIVALENTS, END OF PERIOD	355,847	189,251
NON-CASH INVESTING AND FINANCING ACTIVITIES
Right-of-use assets obtained in exchange for lease obligations	15,825	1,574
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for operating leases	$ 1,616	$ 1,135