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Long-Term Debt - Additional Information (Detail) |  | 1 Months Ended | 6 Months Ended | 66 Months Ended | 88 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2014 | Oct. 31, 2014 USD ($) | Nov. 30, 2012 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2013 USD ($) | Mar. 31, 2013 USD ($) | Mar. 31, 2015 USD ($) | 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 |  |  |  | $ 327,000,000 |  |  | $ 330,000,000 |  |
Bank Credit Facility, borrowings available |  |  |  | 164,000,000 |  |  |  |  |
Letter of Credit Facility |  |  |  | 50,000,000 |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | $ 9,000,000 |  |  |  |  |
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 points |  |  |  |  |
Discount on Senior Notes principal and interest |  |  |  | 0.50% |  |  |  |  |
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 | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable margin | 0.00% |  |  |  |  |  |  |  |
Federal Funds Effective Swap Rate | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable margin | 1.25% |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit Facility, principal balance |  |  |  | $ 500,000,000 |  |  |  |  |
Credit Facility, maturity date |  |  |  | Oct. 30, 2019 |  |  |  |  |
Credit Facility, interest rate description |  |  |  | At the option of the Company, 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 | 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% |  |  |  |  |
Swingline Loan [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit Facility, principal balance |  |  |  | $ 25,000,000 |  |  |  |  |
2005 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior Notes, sale |  |  |  |  |  |  |  |  | $ 200,000,000
Number of tranches | Loan |  |  |  |  |  |  |  |  | 3
Senior Notes, repurchased amount |  |  |  |  |  | $ 81,100,000 |  |  |
Senior Notes, payment terms |  |  |  | Interest for each tranche of Notes is payable semi-annually on the 15th day of May and the 15th day of November of each year until all principal is paid for the respective tranche. |  |  |  |  |
2005 Note Purchase Agreement [Member] | Series 2005A Tranche A [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayment of Senior Note |  |  | $ 4,700,000 |  |  |  |  |  |
2007 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior Notes, sale |  |  |  |  |  |  |  | $ 200,000,000 |
Number of tranches | Loan |  |  |  |  |  |  |  | 4 |
Senior Notes, repurchased amount |  |  |  |  | $ 122,000,000 |  |  |  |
Senior Notes, payment terms |  |  |  | Interest for each tranche of Notes is payable semi-annually on the second day of April and the second day of October of each year until all principal is paid for the respective tranche. |  |  |  |  |
2007 Note Purchase Agreement [Member] | Series 2007A Tranche A [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayment of Senior Note |  | $ 9,500,000 |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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