Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Cash flows from operating activities:
Net income	$ 32,776us-gaap_NetIncomeLoss	$ 37,478us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,043us-gaap_DepreciationAndAmortization	34,477us-gaap_DepreciationAndAmortization
Benefit for deferred income taxes	(1,074)us-gaap_DeferredIncomeTaxExpenseBenefit	(6,393)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock option exercises	(5,495)	(70)
Share-based compensation expense	4,113us-gaap_ShareBasedCompensation	4,576us-gaap_ShareBasedCompensation
Loss on disposition of property and equipment, net	281	171
Changes in assets and liabilities:
Receivables	8,081us-gaap_IncreaseDecreaseInReceivables	(3,986)us-gaap_IncreaseDecreaseInReceivables
Inventories	(38,995)us-gaap_IncreaseDecreaseInInventories	(56,761)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	14,036	(1,162)
Payables, accrued expenses and other liabilities	(40,899)	16,155
Net cash provided by operating activities	7,867	24,485
Cash flows from investing activities:
Cash paid for property and equipment	(31,815)	(38,555)
Cash paid for marketable securities	(55,760)	(169,707)
Sales and maturities of marketable securities	80,942	485,375
Net cash (used in) provided by investing activities	(6,633)	277,113
Cash flows from financing activities:
Proceeds from the exercise of stock options	40,268	798
Excess tax benefits from stock option exercises	5,495	70
Share repurchases related to share repurchase program	(17,306)	(353,315)
Share repurchases related to taxes for share-based awards	(7,976)	(61)
Net cash provided by (used in) financing activities	20,481	(352,508)
Effect of exchange rate changes on cash and cash equivalents	658	677
Increase (decrease) in cash and cash equivalents	22,373	(50,233)
Cash and cash equivalents at beginning of period	154,558	242,058
Cash and cash equivalents at end of period	176,931	191,825
Cash paid during the year for:
Income taxes	9,531us-gaap_IncomeTaxesPaid	14,080us-gaap_IncomeTaxesPaid
Non-cash investing activities-Accrued capital expenditures	$ 28,903	$ 41,542

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, 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.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration