Consolidated funded indebtedness ratio.

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Debt instrument calculation of make whole amount description.

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Debt instrument covenant percentage of consolidated assets.

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Debt Instrument covenant percentage of consolidated revenues.

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Debt instrument maturity period.

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Debt instrument permitted minimum aggregate principal amount prepayment without penalty.

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Discount on senior notes principal and interest percentage.

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- Definition

Interest coverage ratio minimum.

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Letter of credit maximum capacity.

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No definition available.

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Number of tranches.

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Percentage of face value to be paid if notes are prepaid.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

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

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- Definition

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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No definition available.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
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Percentage of principal amount of debt redeemed.

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No definition available.

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Weighted average interest rate of debt outstanding.

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No definition available.

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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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No definition available.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Indebtedness - Additional Information (Detail)			12 Months Ended
Indebtedness - Additional Information (Detail)	Aug. 02, 2016 USD ($)	Oct. 31, 2014	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015	Oct. 02, 2007 USD ($) Loan	Nov. 15, 2005 USD ($) Loan
Debt Instrument [Line Items]
Interest coverage ratio		250.00%
Unused line of credit commitment fee based on leverage ratio		0.10%
Borrowings outstanding under Credit Facility			$ 225,000,000	$ 382,000,000
Bank Credit Facility, borrowings available			266,200,000
Letter of Credit Facility			40,000,000
Letters of credit outstanding, amount			$ 8,800,000
Maximum [Member]
Debt Instrument [Line Items]
Consolidated funded indebtedness ratio		350.00%
Unused line of credit commitment fee based on leverage ratio		0.35%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Variable margin		1.00%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Variable margin		2.25%
Federal Funds Effective Swap Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Variable margin		0.00%
Federal Funds Effective Swap Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Variable margin		1.25%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Weighted-average interest rate			1.90%	1.60%	1.50%
Interest rate of debt instrument			2.40%	1.80%
Credit Facility, principal balance			$ 500,000,000
Credit Facility, termination date			Aug. 02, 2021
Credit Facility, interest rate description			At our option, outstanding principal amounts on the Credit Facility bear interest at a variable rate equal to (i) LIBOR, plus an agreed margin (ranging from 100 to 225 basis points), which is to be established quarterly based upon the Company’s ratio of consolidated EBITDA, defined as earnings before interest, taxes, depreciation and amortization, to the Company’s consolidated indebtedness (the “Leverage Ratio”), or (ii) an alternative base rate which is the higher of (a) the prime rate or (b) the federal funds rate plus 1/2% per annum plus an agreed margin (ranging from 0 to 125 basis points). Interest payments are payable, in the case of loans bearing interest at a rate based on the federal funds rate, quarterly, or in the case of loans bearing interest at a rate based on LIBOR, at the end of the LIBOR advance periods, which can be a period of up to nine months at the option of the Company. The Company is also required to pay a commitment fee on unused available borrowings under the Credit Facility ranging from 10 to 35 basis points depending upon the Leverage Ratio.
Line of Credit \| Federal Funds Effective Swap Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Variable margin		0.50%
Letter of Credit [Member]
Debt Instrument [Line Items]
Bank Credit Facility, one-time fee			0.125%
Private Placement Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-average interest rate			6.00%	5.90%	5.80%
Interest rate of debt instrument			6.00%	5.90%
Senior Notes, permitted minimum aggregate principal amount prepayment without penalty			10.00%
Percentage of face value to be paid if notes are prepaid			100.00%
Senior Notes, calculation of make-whole amount, description			Discounting the remaining scheduled payments of interest and principal of the Senior Notes being prepaid at a discount rate equal to the sum of 50 basis
Discount on Senior Notes principal and interest			0.50%
Swingline Loan [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, principal balance			$ 25,000,000
4.500% Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 350,000,000
Debt instrument, interest rate	4.50%		4.50%
Debt instrument, maturity period	2026-08
4.500% Senior Unsecured Notes Due 2026 [Member] \| Prior to August 1, 2019 [Member]
Debt Instrument [Line Items]
Redemption price, percentage	104.50%
4.500% Senior Unsecured Notes Due 2026 [Member] \| On or After August 1, 2019 and Prior to August 1, 2021 [Member]
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
4.500% Senior Unsecured Notes Due 2026 [Member] \| Maximum [Member] \| Prior to August 1, 2019 [Member]
Debt Instrument [Line Items]
Percentage of principal amount redeemable	40.00%
2005 Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Senior Notes, sale							$ 200,000,000
Number of tranches \| Loan							3
2005 Note Purchase Agreement [Member] \| Series 2005A Tranche C [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 57,200,000
Debt instrument, interest rate			5.48%
Senior Notes, payment terms			Interest for this tranche of Series 2005A Senior Unsecured Notes is payable semi-annually on May 15 and November 15 of each year until all principal is paid.
2007 Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Interest coverage ratio			250.00%
Senior Notes, sale						$ 200,000,000
Number of tranches \| Loan						4
Senior Notes, payment terms			Interest for each tranche of Series 2007A Senior Unsecured Notes is payable semi-annually on April 2 and October 2 of each year until all principal is paid for the respective tranche.
Purchase agreement additional requirements			The 2007A Note Purchase Agreement requires us to maintain an interest coverage ratio (Consolidated EBITDA to Consolidated Interest Expense (calculated as Consolidated EBITDA, defined above, to consolidated interest expense)) of at least 2.50 to 1.0. In addition, the 2007 Note Purchase Agreement requires the Company to ensure that at all times either (i) Consolidated Total Assets equal at least 80% of the consolidated total assets of the Company and its Subsidiaries, determined in accordance with GAAP, and (ii) consolidated total revenues of the Company and its Restricted Subsidiaries for the period of four consecutive fiscal quarters most recently ended equals at least 80% of the consolidated total revenues of the Company and its Subsidiaries during such period.
2007 Note Purchase Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of consolidated assets require to maintain			80.00%
Percentage of consolidated revenues require to maintain			80.00%
Private Placement Note Purchase Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Consolidated funded indebtedness ratio			350.00%