Indebtedness - Debt Outstanding (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Debt Instrument [Line Items]
Capitalized lease obligations	$ 22	$ 106
Less amounts representing interest	(1)	(3)
Total debt	160,639	159,074
Less current maturities of long-term debt	(9)	(88)
Total long-term debt	160,630	158,986
8.0% Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible Notes	97,570	97,205
Convertible Senior Notes [Member] \| 4.25% Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible Notes	$ 63,048	$ 61,766

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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