Indebtedness - Narrative (Detail) (USD $)	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended	0 Months Ended			0 Months Ended	5 Months Ended	0 Months Ended		0 Months Ended							9 Months Ended			0 Months Ended		9 Months Ended		0 Months Ended
	Oct. 31, 2013 Prior to June 2013 Amendment [Member] Shelf Agreement [Member] Unsecured Notes [Member]	Oct. 31, 2013 September 2013 Amendment [Member]	Jul. 31, 2013 Credit Agreement [Member]	Oct. 31, 2013 Credit Agreement [Member] September 2013 Amendment [Member]	Sep. 05, 2013 Credit Agreement [Member] September 2013 Amendment [Member]	Jan. 31, 2014 Scenario, Forecast [Member] November 2013 Amendment [Member]	Dec. 05, 2013 Subsequent Event [Member] 4.25% Convertible Senior Notes due 2018 [Member]	Nov. 05, 2013 Subsequent Event [Member] 4.25% Convertible Senior Notes due 2018 [Member] D	Nov. 12, 2013 Subsequent Event [Member] 4.25% Convertible Senior Notes due 2018 [Member]	Nov. 12, 2013 Subsequent Event [Member] Convertible Notes Offering [Member]	Nov. 04, 2013 Subsequent Event [Member] June 2013, September 2013 and November 2013 Amendment [Member]	Nov. 12, 2013 Subsequent Event [Member] Credit Agreement [Member]	Nov. 15, 2013 Subsequent Event [Member] Credit Agreement [Member]	Nov. 12, 2013 Subsequent Event [Member] Credit Agreement [Member] November 2013 Amendment [Member]	Nov. 04, 2013 Subsequent Event [Member] Credit Agreement [Member] November 2013 Amendment [Member]	Nov. 12, 2013 Subsequent Event [Member] Credit Agreement [Member] LIBOR [Member] November 2013 Amendment [Member]	Nov. 04, 2013 Subsequent Event [Member] Credit Agreement [Member] LIBOR [Member] November 2013 Amendment [Member]	Nov. 12, 2013 Subsequent Event [Member] Credit Agreement [Member] Base Rate [Member] November 2013 Amendment [Member]	Nov. 04, 2013 Subsequent Event [Member] Credit Agreement [Member] Base Rate [Member] November 2013 Amendment [Member]	Nov. 05, 2013 Subsequent Event [Member] Measurement Period [Member] 4.25% Convertible Senior Notes due 2018 [Member]	Oct. 31, 2013 Maximum [Member] June 2013 Amendment [Member]	Oct. 31, 2013 Maximum [Member] Credit Agreement [Member] LIBOR [Member] September 2013 Amendment [Member]	Oct. 31, 2013 Maximum [Member] Credit Agreement [Member] Base Rate [Member] September 2013 Amendment [Member]	Nov. 05, 2013 Maximum [Member] Subsequent Event [Member] 4.25% Convertible Senior Notes due 2018 [Member]	Nov. 12, 2013 Maximum [Member] Subsequent Event [Member] Credit Agreement [Member] November 2013 Amendment [Member]	Oct. 31, 2013 Minimum [Member] Credit Agreement [Member] LIBOR [Member] September 2013 Amendment [Member]	Oct. 31, 2013 Minimum [Member] Credit Agreement [Member] Base Rate [Member] September 2013 Amendment [Member]	Nov. 04, 2013 Minimum [Member] Scenario, Forecast [Member] November 2013 Amendment [Member]	Nov. 05, 2013 Minimum [Member] Subsequent Event [Member] 4.25% Convertible Senior Notes due 2018 [Member]	Nov. 12, 2013 Minimum [Member] Subsequent Event [Member] Credit Agreement [Member] November 2013 Amendment [Member]
Debt Instrument [Line Items]
Relocation expense excluded from Adjusted EBITDA, per quarter																					$ 3,000,000
Percentage of equity interest of foreign subsidiaries pledge as collateral																					65.00%
Amount of debt instrument available for issuance	150,000,000
Expiration date for issuance of debt instrument	Jul. 08, 2021
Interest rate description				The Credit Agreement reduced the commitments from $300.0 million to $200.0 million, provided for interest at variable rates equal to, at the Company’s option, a LIBOR rate plus 1.5% to 3.0% or, a base rate (as defined in the Credit Agreement), plus 0.5% to 2.0%, each depending on the Company’s leverage ratio.										The interest rate under the Credit Agreement was reduced to, at the Company's option, either the LIBOR rate plus 4.0% or the base rate plus 3.0% until the delivery of the financial statements for the fiscal year ended January 31, 2015, at which time the interest rate will vary based on the Company's leverage	Temporarily increase the interest rate under the Credit Agreement to LIBOR plus 6.0% (or the base rate plus 5.0%)
Maximum borrowing capacity			300,000,000		200,000,000							150,000,000		150,000,000	180,000,000
Percent added to reference rate in effect from time to time to set the interest rate																4.00%	6.00%	3.00%	5.00%			3.00%	2.00%			1.50%	0.50%
Proceeds from offering of permitted convertible notes																												75,000,000
Asset coverage ratio																														200.00%
Unrestricted cash																									15,000,000
Minimum liquidity												50,000,000		50,000,000
Net proceeds from issuance of notes								105,200,000		106,400,000
Amount available for borrowing under the facility													71,500,000
Outstanding letters of credit													28,500,000
Fees incurred											1,500,000
Amendment fee written off		400,000
Amendment fee expected to be written off						300,000
Debt instrument issuance date								Nov. 12, 2013
Aggregate principal amount								110,000,000	110,000,000
Debt Instrument, stated percentage								4.25%	4.25%
Debt instrument agreement date								Nov. 05, 2013
Additional aggregate principal amount																								15,000,000
Proceeds from additional issuance of notes							14,600,000
Debt instrument trading days								20
Debt instrument consecutive trading days								30 days												5 days
Debt instrument convertible threshold percentage																								130.00%
Debt instrument convertible threshold percentage																				98.00%
Debt instrument frequency of periodic payment								The 4.25% Convertible Notes bear interest at a rate of 4.25% per year, payable semi-annually in arrears in cash on May 15 and November 15 of each year
Debt instrument maturity, Beginning date								May 15, 2014
Debt instrument maturity, Ending date								Nov. 15, 2018
Common stock initial conversion rate								43.6072
Common stock conversion principal amount								1,000
Initial conversion price per share								$ 22.93
Percentage of redemption price																													130.00%
Redemption price percentage of principal amount redeemed								100.00%
Principal amount of the liability component								93,300,000
Discount rate								8.00%
Carrying amount of equity component								16,700,000
Discount and commission and the offering costs								$ 600,000
Convertible Notes maturing period								5 years