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Secured Credit Facility (Details) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Feb. 23, 2016 USD ($) | Jul. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Current portion of long-term debt |  | $ 13,281,000 |  | $ 13,281,000 |  | $ 11,067,000 |  |
Non-current portion of long-term debt, net |  | 229,834,000 |  | 229,834,000 |  | 239,969,000 |  |
Repayment of term loan facility |  |  |  | 4,427,000 | $ 0 |  |  |
Cash and cash equivalents |  | 63,144,000 | $ 163,466,000 | 63,144,000 | 163,466,000 | 66,805,000 |  | $ 150,953,000
Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  | 243,115,000 |  | 243,115,000 |  | 251,036,000 |  |
Current portion of long-term debt |  | 13,281,000 |  | 13,281,000 |  | 11,067,000 |  |
Non-current portion of long-term debt, net |  | 229,834,000 |  | 229,834,000 |  | 239,969,000 |  |
Secured credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 400,000,000 |
Interest expense related to Credit Facility |  | 2,708,000 | $ 0 | 5,883,000 | $ 0 |  |  |
Outstanding standby letters of credit at period end |  | 3,690,000 |  | 3,690,000 |  |  |  |
Outstanding commercial letters of credit at period end |  | 0 |  | 0 |  |  |  |
Maximum amount of available cash on hand that can be used in leverage ratio calculation |  | $ 50,000,000 |  | 50,000,000 |  |  |  |
Leverage ratio |  | 2.57 |  |  |  |  |  |
Maximum allowable leverage ratio included in financial covenants |  | 3.00 |  |  |  |  |  |
Term Loan Facility | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross |  | $ 168,220,000 |  | 168,220,000 |  | 172,647,000 |  |
Unamortized deferred financing costs |  | 4,909,000 |  | 4,909,000 |  | 5,515,000 |  |
Long-term Debt |  | 163,311,000 |  | 163,311,000 |  | 167,132,000 |  |
Secured credit facility, maximum borrowing capacity |  |  |  |  |  |  | 250,000,000 |
Repayment of term loan facility |  |  |  | 4,427,000 |  |  |  |
Revolving Loan Facility | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  | $ 79,804,000 |  | $ 79,804,000 |  | $ 83,904,000 |  |
Secured credit facility, maximum borrowing capacity |  |  |  |  |  |  | 150,000,000 |
Revolving Loan Facility | Letter of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Secured credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 25,000,000 |
Federal Funds Rate | Revolving Loan Facility | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (percent) |  |  |  | 0.50% |  |  |  |
Adjusted LIBO rate | Revolving Loan Facility | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (percent) |  |  |  | 1.00% |  |  |  |
Floor interest rate |  |  |  | 1.00% |  |  |  |
Minimum | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Blended interest rate (percent) |  | 4.79% |  | 4.79% |  |  |  |
Minimum | Revolving Loan Facility | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  | $ 56,904,000 |  | $ 56,904,000 |  |  |  |
Maximum | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Blended interest rate (percent) |  | 5.06% |  | 5.06% |  |  |  |
Maximum | Revolving Loan Facility | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  | $ 84,904,000 |  | $ 84,904,000 |  |  |  |
Subsequent Event | Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum allowable leverage ratio included in financial covenants | 2.75 |  |  |  |  |  |  |

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- Definition Represents the ratio calculated at period-end by total indebtedness less available cash (up to $50,000,000) divided by the trailing twelve months Consolidated EBITDA defined in the Secured Credit Facility. + References No definition available. + Details
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- Definition Maximum allowable leverage ratio included in financial covenants required by the lender, which is calculated based on (a) total indebtedness as of the date minus the lesser of (i) available cash on such date and (ii) $50.0 million divided by (b) Consolidated EBITDA (as defined in the Secured Credit Facility agreement) for the period of four consecutive fiscal quarters of the Borrower most recently ended prior to such date. + References No definition available. + Details
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