Debt and Capital Lease Obligations - Senior Notes (Details) |
Apr. 30, 2018
USD ($)
exception
|
Jul. 01, 2014
USD ($)
|
|---|---|---|
| Debt Instrument [Line Items] | ||
| Original Principal Amount | $ 1,094,276,000 | |
| Senior Notes [Member] | Senior Unsecured Notes Due July 2022 [Member] | ||
| Debt Instrument [Line Items] | ||
| Original Principal Amount | $ 250,000,000 | |
| Interest rate on notes (in hundredths) | 7.25% | |
| Effective interest rate | 7.80% | |
| Number of exceptions for limitations | exception | 2 | |
| Restricted payment basket amount | $ 375,000,000.0 | |
| Leverage ratio | 2.50 | |
| Restrictions on payment of dividends, amount free from restriction | $ 183,500,000 | |
| Trigger amount under indenture | $ 25,000,000 | |
| Line of Credit [Member] | Revolving Credit Facility [Member] | ||
| Debt Instrument [Line Items] | ||
| Restrictions on payment of dividends, amount free from restriction | $ 64,700,000 |