Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Notes Payable - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Jan. 31, 2016	Apr. 30, 2015	Jul. 31, 2015	Jul. 06, 2015	Jun. 18, 2015	Jun. 15, 2015
Debt Instrument [Line Items]
Credit facility, maturity	Jun. 15, 2020
Interest description of revolving line of credit	The Revolving Line provides for availability until June 15, 2020 for general corporate purposes, with borrowings to bear interest at a variable rate equal to LIBOR or prime plus an applicable margin based on our consolidated leverage ratio, at our election.
Percentage of interest rate protection on term loan					75.00%
Fair value of the interest rate swap liability	$ 1,200,000
Senior Notes Indenture, number of shares allowed for repurchase	$ 50,000,000
Maximum consolidated coverage ratio	300.00%
Minimum consolidated coverage ratio	100.00%
Term Loan
Debt Instrument [Line Items]
Outstanding debt	$ 101,900,000					$ 105,000,000
Principal payments per annum	6,300,000
Debt Issuance Cost	$ 1,000,000
Debt Instrument, Interest Rate, Effective Percentage	3.06%
5.875% Senior notes due 2017
Debt Instrument [Line Items]
Outstanding debt	$ 100,000,000
Debt instrument, interest rate	5.875%
Debt instrument call premium value	$ 2,900,000
Unamortized debt-issuance costs	$ 1,700,000
5.000% Senior Notes due 2018
Debt Instrument [Line Items]
Debt instrument, interest rate	5.00%	5.00%
Debt Issuance Cost		$ 2,300,000
Notes issued		$ 75,000,000
Debt Instrument Maturity Date	Jul. 15, 2018
Senior Notes Indenture, maximum number of shares allowed for repurchase as a percentage of Consolidated net income for previous four consecutive published fiscal quarters	75.00%
5.000% Senior Notes due 2018 \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Description of redemption for senior notes	(a) upon not less than 30 nor more than 60 days’ prior notice, redeem all or a portion of the 5.000% Senior Notes at a redemption price of 100% of the principal amount of the 5.000% Senior Notes, plus an applicable premium, plus accrued and unpaid interest as of the redemption date; or (b) redeem up to 35% of the aggregate principal amount of the 5.000% Senior Notes with the net cash proceeds of one or more equity offerings at a redemption price of 105.000% of the principal amount of the 5.000% Senior Notes, plus accrued and unpaid interest as of the redemption date; provided, that in the case of the foregoing clause, at least 65% of the aggregate original principal amount of the 5.000% Senior Notes remains outstanding, and the redemption occurs within 60 days after the closing of the equity offering.
5.000% Senior Notes due 2018 \| Debt Instrument, Redemption, Period One \| Debt Instrument Redemption Scenario One
Debt Instrument [Line Items]
Redemption price of senior notes	100.00%
Percentage of principal amount that remains outstanding	65.00%
5.000% Senior Notes due 2018 \| Debt Instrument, Redemption, Period One \| Debt Instrument Redemption Scenario Two
Debt Instrument [Line Items]
Redemption price of senior notes	105.00%
Percentage of redeem notes	35.00%
5.000% Senior Notes due 2018 \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Description of redemption for senior notes	upon not less than 30 nor more than 60 days’ prior notice, redeem all or a portion of the 5.000% Senior Notes at a redemption price of (a) 102.500% of the principal amount of the 5.000% Senior Notes to be redeemed, if redeemed during the 12-month period beginning on July 15, 2016; or (b) 100% of the principal amount of the 5.000% Senior Notes to be redeemed, if redeemed during the 12-month period beginning on July 15, 2017, plus, in either case, accrued and unpaid interest on the 5.000% Senior Notes as of the applicable redemption date
5.000% Senior Notes due 2018 \| Debt Instrument, Redemption, Period Two \| Debt Instrument Redemption Scenario One
Debt Instrument [Line Items]
Redemption price of senior notes	102.50%
5.000% Senior Notes due 2018 \| Debt Instrument, Redemption, Period Two \| Debt Instrument Redemption Scenario Two
Debt Instrument [Line Items]
Redemption price of senior notes	100.00%
5.000% Senior Notes due 2018 \| Minimum
Debt Instrument [Line Items]
Senior Notes Indenture, number of shares allowed for repurchase	$ 50,000,000
5.000% Senior Notes due 2018 \| Minimum \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Notice period of senior notes	30 days
5.000% Senior Notes due 2018 \| Minimum \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Notice period of senior notes	30 days
5.000% Senior Notes due 2018 \| Maximum
Debt Instrument [Line Items]
Senior Notes Indenture, number of shares allowed for repurchase	$ 75,000,000
5.000% Senior Notes due 2018 \| Maximum \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Notice period of senior notes	60 days
5.000% Senior Notes due 2018 \| Maximum \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Notice period of senior notes	60 days
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity						$ 175,000,000
Credit Facilities
Debt Instrument [Line Items]
Borrowings outstanding	$ 0
Outstanding letters of credit	$ 1,000,000
Prime Rate Option \| Credit Facilities
Debt Instrument [Line Items]
Interest rate on borrowings	3.75%
LIBOR Rate Option \| Term Loan
Debt Instrument [Line Items]
Interest rate on borrowings	1.925%
LIBOR Rate Option \| Credit Facilities \| Minimum
Debt Instrument [Line Items]
Interest rate on borrowings	1.93%
LIBOR Rate Option \| Credit Facilities \| Maximum
Debt Instrument [Line Items]
Interest rate on borrowings	2.12%
Interest Rate Swap
Debt Instrument [Line Items]
Percentage of floating rate debt covered					100.00%
Derivative, Notional Amount					$ 105,000,000
Derivative, Maturity Date	Jun. 15, 2020
Derivative, Fixed Interest Rate				1.56%
Derivative, Variable Interest Rate Of one-month LIBOR			0.188%