Significant accounting policies.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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-Name Accounting Standards Codification
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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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-Publisher FASB
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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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- Definition

For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Accounting Policies and Basis of Presentation - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jul. 31, 2016 USD ($) shares	Jul. 31, 2015 USD ($) shares	Jul. 31, 2016 USD ($) Segments shares	Jul. 31, 2015 USD ($) shares	Jan. 31, 2016 USD ($)	Mar. 02, 2015
Significant Accounting Policies [Line Items]
Impairment charges		$ 4,598,000		$ 4,598,000
Issuance of nonvested shares (in shares) \| shares			0
Number of reportable segments \| Segments			4
Net foreign currency transaction gains (losses)	$ (62,000)	$ 111,000	$ (146,000)	$ (48,000)
Supplies	19,000,000		19,000,000		$ 16,800,000
Raw materials	$ 2,400,000		$ 2,400,000		2,700,000
Method used to determine the fair value of equity-based compensation granted			The fair value of service-based equity-based compensation granted in the form of stock options is determined using a lattice valuation model and for certain market-based awards the fair value is determined using a Monte Carlo simulation model.
8.0% Convertible Notes [Member]
Significant Accounting Policies [Line Items]
Debt instrument, stated percentage	8.00%		8.00%			8.00%
Convertible Senior Notes [Member] \| 4.25% Convertible Notes [Member]
Significant Accounting Policies [Line Items]
Debt instrument, stated percentage	4.25%		4.25%			4.25%
Stock Option [Member]
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from weighted average shares \| shares	900,000	1,100,000	900,000	1,100,000
Nonvested Stock [Member]
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from weighted average shares \| shares	1,900,000	1,500,000	1,900,000	1,500,000
Heavy Civil and Mineral Services [Member]
Significant Accounting Policies [Line Items]
Impairment of long-lived assets			$ 0
Other Assets [Member]
Significant Accounting Policies [Line Items]
Goodwill	$ 8,900,000		8,900,000		8,900,000
Restricted deposits, long term	4,900,000		4,900,000		4,300,000
Other Current Assets [Member]
Significant Accounting Policies [Line Items]
Restricted deposits, current	1,500,000		1,500,000		$ 3,500,000
Other Nonoperating Income (Expense) [Member]
Significant Accounting Policies [Line Items]
Net foreign currency transaction gains (losses)	$ (100,000)	$ 100,000	(100,000)	$ (100,000)
Equity Method Investments [Member]
Significant Accounting Policies [Line Items]
Impairment charges			$ 0