Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	3 Months Ended
Apr. 30, 2011	Apr. 30, 2010
Cash flows from operating activities:
Net income	$ 38,624	$ 52,957
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,551	24,347
Provision for deferred income taxes	(4,246)	(1,649)
Excess tax benefit on share-based compensation	(361)	(7,673)
Share-based compensation expense	2,579	2,200
Loss (gain) on disposition of property and equipment, net	626	(28)
Changes in assets and liabilities:
Receivables	(9,915)	3,162
Inventories	(33,802)	(36,344)
Prepaid expenses and other assets	2,312	6,301
Payables, accrued expenses and other liabilities	(2,328)	8,758
Net cash provided by operating activities	20,040	52,031
Cash flows from investing activities:
Cash paid for property and equipment	(35,738)	(32,351)
Cash paid for marketable securities	(51,119)	(46,299)
Sales and maturities of marketable securities	115,442	116,392
Net cash provided by investing activities	28,585	37,742
Cash flows from financing activities:
Exercise of stock options	2,353	4,209
Excess tax benefits from stock option exercises	361	7,673
Share repurchases	(148,674)
Net cash (used in) provided by financing activities	(145,960)	11,882
Effect of exchange rate changes on cash and cash equivalents	1,017	(1,331)
(Decrease) increase in cash and cash equivalents	(96,318)	100,324
Cash and cash equivalents at beginning of period	340,257	159,024
Cash and cash equivalents at end of period	243,939	259,348
Cash paid during the year for:
Income taxes	46,990	34,282
Non-cash investing activities-Accrued capital expenditures	$ 8,281	$ 13,727

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.

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The net change between the beginning and ending balance of cash and cash equivalents.

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The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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The effect of exchange rate changes on cash balances held in foreign currencies.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss).

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The net change during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.

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The net change during the reporting period in the value of this group of assets within the working capital section.

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The net change during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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The net cash inflow (outflow) from financing activity for the period.

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The net cash inflow (outflow) from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The cash outflow to reacquire common stock during the period.

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The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (trading, held-to-maturity, or available-for-sale) during the period.

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The cash inflow associated with the amount received from holders exercising their stock options.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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