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Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales and maturities of available-for-sale securities			$ 296,172	$ 720,668
Amortization of discounts and premiums, net	$ 997	$ 1,309	3,155	5,416
Other income (expense), net
Schedule of Available-for-sale Securities [Line Items]
Net realized gains	$ 11	$ 30	$ 53	$ 202

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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