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Basic and Diluted Earnings per Common Share Attributable to Common Stockholders (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Earnings Per Share Disclosure [Line Items]
Net income	$ 22,939us-gaap_NetIncomeLoss	$ 21,304us-gaap_NetIncomeLoss	$ 62,875us-gaap_NetIncomeLoss	$ 51,480us-gaap_NetIncomeLoss
Less: undistributed earnings to nonvested restricted stockholders	223us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic		632us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Basic net earnings attributable to common stockholders	22,716us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	21,304us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	62,243us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	51,480us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Add: undistributed earnings to nonvested restricted stockholders	223us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic		632us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Less: reallocation of undistributed earnings to nonvested restricted stockholders	220us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted		623us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted
Diluted net earnings attributable to common stockholders	$ 22,719us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 21,304us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 62,252us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 51,480us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Basic weighted-average number of common shares outstanding	49,135us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	48,341us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	48,973us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	48,041us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted-average number of common shares outstanding	49,724us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	49,181us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	49,663us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	48,977us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 1.27us-gaap_EarningsPerShareBasic	$ 1.07us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.43us-gaap_EarningsPerShareDiluted	$ 1.25us-gaap_EarningsPerShareDiluted	$ 1.05us-gaap_EarningsPerShareDiluted
ESPP
Earnings Per Share Disclosure [Line Items]
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Restricted Stock
Earnings Per Share Disclosure [Line Items]
Stock	491us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	651us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	578us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	728us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Stock Options
Earnings Per Share Disclosure [Line Items]
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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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