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Debt - Additional Information (Detail)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||||||||
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Mar. 31, 2013
USD ($)
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Mar. 31, 2012
USD ($)
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Mar. 31, 2011
USD ($)
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Mar. 31, 2013
Option Two
Libor Rate
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Mar. 31, 2013
Option Two
Federal Funds Rate
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Mar. 31, 2013
2011 Senior Secured Revolving Credit Facility
USD ($)
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Mar. 31, 2013
2011 Senior Secured Revolving Credit Facility
Option One
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Mar. 31, 2013
2011 Senior Secured Revolving Credit Facility
Option Two
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Mar. 31, 2013
Applicable Percentage
Option One
Libor Rate
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Mar. 31, 2013
Applicable Percentage
Option Two
Libor Rate
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Mar. 31, 2013
Secured Debt
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Mar. 31, 2013
China Term Loan due 2017
CNY
Y
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Mar. 31, 2013
India Term Loan due 2017
USD ($)
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Mar. 31, 2013
India Term Loan due 2017
INR
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May 28, 2008
Convertible Notes Payable
USD ($)
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Mar. 31, 2013
Convertible Notes Payable
USD ($)
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Mar. 31, 2012
Convertible Notes Payable
USD ($)
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Mar. 31, 2011
Convertible Notes Payable
USD ($)
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Mar. 31, 2013
Senior Unsecured 3.375% Convertible Notes Due 2038
USD ($)
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Mar. 31, 2012
Senior Unsecured 3.375% Convertible Notes Due 2038
USD ($)
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Mar. 31, 2011
Senior Unsecured 3.375% Convertible Notes Due 2038
USD ($)
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| Debt Instrument [Line Items] | |||||||||||||||||||||
| Senior secured revolving credit facility, initiation date | Mar. 29, 2011 | ||||||||||||||||||||
| Maximum borrowing capacity | $ 350,000,000 | 75,000,000 | 273,780,000 | ||||||||||||||||||
| Maturity date | Mar. 31, 2016 | Jun. 01, 2038 | |||||||||||||||||||
| Liquidity test required to be met | February 2015 | ||||||||||||||||||||
| Capacity to meet potential obligations related to Convertible Notes | June 2015 | ||||||||||||||||||||
| Interest on borrowings at a floating rate | ("LIBOR") plus an applicable percentage (currently 1.25%) | The greater of the Federal Funds rate plus 0.50% or the prime rate, or one-month LIBOR plus 1.0%, plus an applicable percentage (currently 0.25%) | |||||||||||||||||||
| Interest at a floating rate | 1.00% | 0.25% | 1.25% | 0.50% | |||||||||||||||||
| Interest rate of debt instrument | 0.00% | 3.375% | 3.375% | ||||||||||||||||||
| Company owned capital stock percentage | 65.00% | ||||||||||||||||||||
| Term loan (in years) | 6 | ||||||||||||||||||||
| Short term borrowing outstanding amount | 22,702,000 | 16,042,000 | 15,077,000 | ||||||||||||||||||
| Face value of debt instrument | 172,500,000 | 172,500,000 | 172,500,000 | ||||||||||||||||||
| Debt instrument maturity year | 2017 | 2017 | 2038 | 2038 | |||||||||||||||||
| Net proceeds received after deduction of commissions and offering expenses | 168,200,000 | ||||||||||||||||||||
| Semi-annual payment of interest in arrears | June 1 and December 1 | ||||||||||||||||||||
| Initial conversion rate | 24.6305 | ||||||||||||||||||||
| Principal amount of Convertible Notes | 1,000 | ||||||||||||||||||||
| Conversion price per share | $ 40.60 | $ 40.60 | |||||||||||||||||||
| Redemption price percentage of debt instrument of accreted principal amount | 100.00% | ||||||||||||||||||||
| Minimum price of Common Stock per share for eligibility of make-whole premium payment | $ 29.00 | ||||||||||||||||||||
| Amortized remaining discount period | 26 months | ||||||||||||||||||||
| Aggregate consideration on conversion shares | 4,248,761 | ||||||||||||||||||||
| Interest rate percentage | 8.50% | ||||||||||||||||||||
| Amount of interest cost recognized for the amortization of the discount | 7,001,000 | 6,435,000 | 5,917,000 | ||||||||||||||||||
| Available lines of credit | 469,123,000 | 377,230,000 | |||||||||||||||||||
| Outstanding amount | 120,373,000 | 95,340,000 | |||||||||||||||||||
| Interest paid | 10,056,000 | 8,933,000 | 16,101,000 | ||||||||||||||||||
| Short-term debt, weighted-average interest rates | 9.00% | 9.00% | |||||||||||||||||||
| Stand by letters of credit | 11,854,000 | 9,108,000 | |||||||||||||||||||
| Write-off of unamortized deferred financing fees | 2,308,000 | ||||||||||||||||||||
| New deferred financing fees | 3,500,000 | ||||||||||||||||||||
| Deferred financing fees, net of accumulated amortization | 3,355,000 | 4,634,000 | |||||||||||||||||||
| Amortization expense included in interest expense | $ 1,279,000 | $ 1,278,000 | $ 1,861,000 | ||||||||||||||||||