Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Jul. 31, 2015
Accounting Policies [Abstract]
Interim Financial Information	Interim Financial Information – The consolidated balance sheet as of July 31, 2015, the consolidated statements of income and comprehensive income for the three months ended July 31, 2015 and 2014, the consolidated statement of changes in stockholders’ equity for the three months ended July 31, 2015, and the consolidated statements of cash flows for the three months ended July 31, 2015 and 2014 have been prepared by us and are unaudited. In our opinion, all adjustments, which include only normal recurring adjustments necessary to fairly present the financial position, results of operations, changes in stockholders’ equity, and cash flows at July 31, 2015 and for the periods presented, have been included. All significant intercompany transactions have been eliminated in consolidation. The consolidated balance sheet as of April 30, 2015 has been derived from our audited consolidated financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended April 30, 2015. The results of operations for the three months ended July 31, 2015 may not be indicative of the results that may be expected for the year ending April 30, 2016, or any other period.
Recently Issued Accounting Standards	Recently Issued Accounting Standards – In April 2015, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, 2015-03, Interest - Imputation of Interest (Topic 835-30), which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this ASU. The disclosure requirements are effective for annual periods (and interim periods within those annual periods) beginning after December 15, 2015 and require retrospective application. We elected to early adopt ASU 2015-03. Accordingly, unamortized debt issuance costs of $3.0 million and $4.1 million as of July 31, 2015 and April 30, 2015, respectively, which were previously included in other assets, are included in notes payable in the accompanying consolidated balance sheets. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 is effective for interim reporting periods beginning October 1, 2017. Early adoption is not permitted. We are currently evaluating the impact, if any, that ASU 2014-09 will have on our consolidated financial statements. In July 2015, the FASB issued ASU 2015-11, Inventory - Simplifying the Measurement of Inventory (Topic 330), which simplifies the subsequent measurement of inventories by replacing the lower of cost or market test with a lower of cost and net realizable value test. The guidance applies only to inventories for which cost is determined other than by the last-in first-out (LIFO) method and the retail inventory method. ASU 2015-11 is effective for periods beginning after December 15, 2016 and early adoption is permitted. The new guidance must be applied prospectively. We are currently evaluating the impact, if any, that ASU 2015-11 will have on our consolidated financial statements.