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DEBT - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 13, 2018 | Mar. 31, 2015 | Sep. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Sep. 30, 2017
Line of Credit Facility [Line Items] |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | $ 68,400,000 |  | $ 68,400,000 | $ 68,500,000
Line Of Credit Facility Unused Capacity Commitment Fee Percentage |  |  | 0.40% |  |  |
Letter of Credit Annual Fee Percentage |  |  | 2.25% |  |  |
Line of Credit Facility, Initiation Date | Apr. 13, 2018 | Mar. 31, 2015 |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  | 3.24%
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 231,600,000 |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | base rate plus 2% |  |  |
Long-term Debt |  |  | $ 292,579,000 |  | $ 293,073,000 | $ 135,000,000
Line of Credit Facility, Increase (Decrease), Net | $ 250,000,000 |  |  |  |  |
Debt Issuance Costs, Gross |  |  | $ 9,900,000 |  |  |
Term B Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 5.24% |  |  |
Debt Instrument, Maturity Date | Apr. 13, 2025 |  |  |  |  |
Debt Instrument, Face Amount | $ 300,000,000 |  |  |  |  |
Debt Instrument, Periodic Payment, Principal | 750,000 |  |  |  |  |
Debt Issuance Costs, Gross | 7,100,000 |  |  |  |  |
Eurocurrency Rate [Member] | Term B Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR-equivalent rate plus 3% |  |  |
Base Rate [Member] | Term B Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.00% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 300,000,000 |  |  |  |  |
Line of Credit Facility, Expiration Date | Apr. 13, 2023 | Mar. 31, 2020 |  |  |  |
Foreign Currency Borrowing Capacity | $ 200,000,000 | $ 400,000,000 |  |  |  |
Long-term Debt |  |  |  |  |  | $ 135,000,000
Debt Issuance Costs, Gross | 2,700,000 |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 1.75% |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 2.75% |  |  |
Revolving Credit Facility [Member] | Prime Rate [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 0.75% |  |  |
Revolving Credit Facility [Member] | Prime Rate [Member] | Maximum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 1.75% |  |  |
Letter of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 100,000,000 | $ 100,000,000 |  |  |  |
Letter Of Credit Title IV Disbursement, Amount |  |  |  | $ 68,400,000 |  |

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- Definition Represents the annual fee percentage on letter of credit. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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