Condensed Consolidated and Combined Statements of Changes in Shareholders' Equity - USD ($)	Total	Common Stock	Net Parent Company Investment [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]	Stockholders' Equity, Total [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	$ (1,995,000)					$ (1,995,000)
Net income	22,713,000		$ 4,922,000		$ 17,791,000			$ 22,713,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition				$ 782,000				782,000
Cumulative translation adjustment, net of tax	382,000					$ 382,000		382,000
(Distribution to) Contribution from parent company, net			8,784,000					8,784,000
Dividend paid to parent company			(500,000,000)					(500,000,000)
Separation related adjustments			$ 32,481,000					32,481,000
Reclassification of net parent company investment to common stock and additional paid-in capital in conjunction with the separation, shares		31,956,521					(340,496,000)
Reclassifications of Parent Company Investment to Common Stock and Additional Paid in Capital		$ 320,000		340,176,000
Balance, end of period at Aug. 01, 2014	357,456,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	(1,116,000)
Net income	11,845,000
Cumulative translation adjustment, net of tax	(497,000)
Balance, end of period at Aug. 01, 2014	357,456,000
Retained earnings	$ 17,791,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding	31,956,521
Common stock, par value $0.01- authorized: 480,000,000 shares; issued and outstanding: 31,991,100, 31,956,521, 31,956,521	$ 320,000
Additional paid-in capital	340,958,000
Accumulated other comprehensive loss	(1,613,000)
Retained earnings	$ 68,877,000
Common stock, shares outstanding	31,956,521	31,956,521
Common stock, par value $0.01- authorized: 480,000,000 shares; issued and outstanding: 31,991,100, 31,956,521, 31,956,521	$ 320,000
Additional paid-in capital	342,294,000
Accumulated other comprehensive loss	(7,298,000)
Net income	9,185,000							$ 9,185,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition	1,521,000			1,521,000
Cumulative translation adjustment, net of tax	665,000
Balance, end of period at Jul. 31, 2015	415,119,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ 52,380
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited		(17,801)
Restricted Stock Award, Forfeitures	(445,000)			$ (445,000)
Accumulated other comprehensive loss	(6,935,000)
Net income	7,461,000
Cumulative translation adjustment, net of tax	302,000
Balance, end of period at Jul. 31, 2015	415,119,000
Retained earnings	$ 78,062,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding	31,991,100	31,991,100.0
Common stock, par value $0.01- authorized: 480,000,000 shares; issued and outstanding: 31,991,100, 31,956,521, 31,956,521	$ 320,000
Additional paid-in capital	343,370,000
Accumulated other comprehensive loss	$ (6,633,000)