Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Cash flows from operating activities:
Net (loss) income	$ (3,454)	$ (26,246)	$ 22,228
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	105,730	114,257	106,300
Provision for doubtful accounts	559	1,791	669
Stock-based compensation, excluding cash-settled awards	69,296	65,421	64,387
Amortization of discount on convertible notes	11,243	10,668	10,123
Benefit for deferred income taxes	(7,533)	(16,941)	(5,640)
Excess tax benefits from stock award plans	0	(6)	(523)
Non-cash losses (gains) on derivative financial instruments, net	17	323	(394)
Losses on early retirements of debt	2,150	0	0
Other non-cash items, net	(428)	7,666	12,343
Changes in operating assets and liabilities, net of effects of business combinations:
Accounts receivable	(23,512)	(353)	3,433
Inventories	(2,865)	(286)	(3,258)
Deferred cost of revenue	282	7,124	6,187
Prepaid expenses and other assets	(2,030)	4,941	(2,886)
Accounts payable and accrued expenses	10,158	(9,521)	(15,260)
Deferred revenue	9,686	8,705	(12,364)
Other liabilities	8,599	4,987	(28,515)
Other, net	(1,571)	(115)	73
Net cash provided by operating activities	176,327	172,415	156,903
Cash flows from investing activities:
Cash paid for business combinations, including adjustments, net of cash acquired	(102,978)	(141,803)	(31,358)
Purchases of property and equipment	(35,530)	(27,540)	(25,265)
Purchases of investments	(11,875)	(36,761)	(92,808)
Maturities and sales of investments	8,721	89,342	71,457
Settlements of derivative financial instruments not designated as hedges	(1,558)	(349)	766
Cash paid for capitalized software development costs	(3,126)	(2,338)	(5,027)
Change in restricted cash and bank time deposits, including long-term portion	2,075	(36,579)	11,133
Other investing activities	(210)	0	(4,498)
Net cash used in investing activities	(144,481)	(156,028)	(75,600)
Cash flows from financing activities:
Proceeds from borrowings, net of original issuance discount	444,341	0	0
Repayments of borrowings and other financing obligations	(431,888)	(3,308)	(309)
Payments of equity issuance, debt issuance and other debt-related costs	(7,137)	(249)	(239)
Proceeds from exercises of stock options	0	7	232
Dividends paid to noncontrolling interest	(3,304)	(2,421)	(3,199)
Purchases of treasury stock	0	(46,896)	0
Excess tax benefits from stock award plans	0	6	523
Payments of contingent consideration for business combinations (financing portion) and other financing activities	(7,515)	(4,058)	(7,212)
Net cash used in financing activities	(5,503)	(56,919)	(10,204)
Effect of exchange rate changes on cash and cash equivalents	4,236	(4,210)	(4,066)
Net increase (decrease) in cash and cash equivalents	30,579	(44,742)	67,033
Cash and cash equivalents, beginning of year	307,363	352,105	285,072
Cash and cash equivalents, end of year	$ 337,942	$ 307,363	$ 352,105