Company owned capital stock percentage securing senior secured credit facility

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Debt Instrument, Convertible, Percent of Holders that Exercised Conversion Rights

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Debt Instrument Maturity Year

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Face Value of Convertible Notes with Accrued Interest

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Line of Credit Facility, Increase in Borrowing Capacity Limit

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Line of Credit Facility, Incremental Term Loan Commitment

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Line of Credit Facility, Remaining Borrowing Capacity, Uncommitted Portion

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Stock Price Upon Issuance Of Convertible Notes

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The amount of subsequent adjustments to additional paid in capital for convertible financial instruments where a component of equity and a component of debt are recognized.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments including both interest and principal payments.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Weighted average interest rate of long-term debt outstanding.

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Amount of amortization of other deferred costs recognized in the income statement.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt - Additional Information (Detail) - USD ($)						12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Aug. 04, 2017	Jul. 17, 2015	Jun. 05, 2015	Jul. 08, 2014	May 28, 2008	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Aug. 03, 2017	Jun. 08, 2015	Apr. 23, 2015
Debt Instrument [Line Items]
Line of Credit Facility, Increase in Borrowing Capacity Limit	$ 325,000,000
Company owned capital stock percentage	65.00%
Long-term Debt and Capital Lease Obligations, Current						$ 0	$ 0
Long-term Debt, Weighted Average Interest Rate						3.70%	3.30%
Stock Price Upon Issuance Of Convertible Notes					$ 30.19
Short term borrowing outstanding amount						$ 18,341,000	$ 18,359,000
Short-term debt, weighted-average interest rates						7.00%
Payments of Debt Issuance Costs	$ 2,677,000
Write off of Deferred Debt Issuance Cost	301,000
Deferred financing fees, net of accumulated amortization						$ 5,965,000	4,891,000
Amortization expense included in interest expense						1,302,000	$ 1,388,000	$ 1,464,000
Face Value of Convertible Notes with Accrued Interest										$ 1,000.66
Shares issued from treasury stock to settle conversion premium on Convertible Notes		1,889,431					1,889,431	1,889,431
Debt Instrument, Convertible, Percent of Holders that Exercised Conversion Rights			99.00%
Repayments of Convertible Debt		$ 172,388,000				0	$ 0	$ 172,266,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt						$ 84,140,000		84,140,000
2011 Credit Facility Due 2018
Debt Instrument [Line Items]
Debt instrument maturity year						2018
Convertible Notes Payable
Debt Instrument [Line Items]
Face value of debt instrument					$ 172,500,000
Available lines of credit						$ 613,234,000	475,947,000
Interest rate of debt instrument					3.375%
Amount of interest cost recognized for the amortization of the discount								1,330,000
Stand by letters of credit						3,074,000	2,189,000
Line of Credit Facility, Remaining Borrowing Capacity, Uncommitted Portion						$ 150,459,000	142,872,000
Senior Unsecured 5.00% Due 2023
Debt Instrument [Line Items]
Long-term debt											$ 300,000,000
Interest rate of debt instrument											5.00%
Senior Unsecured 3.375% Convertible Notes Due 2038
Debt Instrument [Line Items]
Interest rate of debt instrument						3.375%					3.375%
Debt instrument maturity year						2038
Interest paid						$ 23,527,000	20,781,000	$ 15,176,000
2017 Revolver borrowings \| Secured Debt [Member]
Debt Instrument [Line Items]
Face value of debt instrument	150,000,000
Available lines of credit						150,000,000
2017 Revolver borrowings \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	600,000,000
Available lines of credit						135,500,000
Long-term Debt and Capital Lease Obligations, Current						3,750,000
2011 Credit Facility Due 2018 \| Secured Debt [Member]
Debt Instrument [Line Items]
Face value of debt instrument									$ 150,000,000
Available lines of credit	123,750,000
2011 Credit Facility Due 2018 \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 500,000,000
Available lines of credit	240,000,000
Incremental Commitment Agreement [Member] \| Secured Debt [Member] \| 2011 Credit Facility Due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment						$ 0	$ 292,500,000
Debt Instrument Quarterly Installments Beginning December 31, 2018 Through December 30, 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	1,875,000
Debt Instrument Quarterly Installments Beginning December 31, 2019 Through December 30, 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	2,813,000
Debt Instrument Quarterly Installments Beginning December 31, 2020 Through September 29, 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	3,750,000
Debt Instrument Final Installments Payable On September 30, 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	$ 105,000,000
London Interbank Offered Rate (LIBOR) [Member] \| 2017 Revolver And 2017 Term Loan [Member]
Debt Instrument [Line Items]
Interest at a floating rate	1.25%
London Interbank Offered Rate (LIBOR) [Member] \| 2017 Revolver And 2017 Term Loan [Member] \| Minimum
Debt Instrument [Line Items]
Interest at a floating rate	1.25%
London Interbank Offered Rate (LIBOR) [Member] \| 2017 Revolver And 2017 Term Loan [Member] \| Maximum
Debt Instrument [Line Items]
Interest at a floating rate	2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Incremental Commitment Agreement [Member] \| Revolving Commitments and/or Term Loans [Member]
Debt Instrument [Line Items]
Interest at a floating rate							1.25%
London Interbank Offered Rate (LIBOR) [Member] \| Incremental Commitment Agreement [Member] \| Revolving Commitments and/or Term Loans [Member] \| Minimum
Debt Instrument [Line Items]
Interest at a floating rate				1.25%
London Interbank Offered Rate (LIBOR) [Member] \| Incremental Commitment Agreement [Member] \| Revolving Commitments and/or Term Loans [Member] \| Maximum
Debt Instrument [Line Items]
Interest at a floating rate				1.75%
Higher of Bank of America Prime Rate or Federal Funds Effective Rate [Member] \| Incremental Commitment Agreement [Member] \| Revolving Commitments and/or Term Loans [Member] \| Minimum
Debt Instrument [Line Items]
Interest at a floating rate				0.25%
Higher of Bank of America Prime Rate or Federal Funds Effective Rate [Member] \| Incremental Commitment Agreement [Member] \| Revolving Commitments and/or Term Loans [Member] \| Maximum
Debt Instrument [Line Items]
Interest at a floating rate				0.75%
Federal Funds Effective Swap Rate [Member] \| 2017 Revolver And 2017 Term Loan [Member]
Debt Instrument [Line Items]
Interest at a floating rate	0.50%
Eurodollar [Member] \| 2017 Revolver And 2017 Term Loan [Member]
Debt Instrument [Line Items]
Interest at a floating rate	1.00%