SCHEDULE 13G 
 
Amendment No. 7 
Devon Group Incorporated 
Common Stock 
Cusip # 251801106 
 
 
Cusip # 251801106 
Item 1:	Reporting Person - FMR Corp. 
Item 4:	Commonwealth of Massachusetts 
Item 5:	None 
Item 6:	None 
Item 7:	853,600 
Item 8:	None 
Item 9:	853,600 
Item 11:	11.60% 
Item 12:	HC  
 
 
 
 
Cusip # 251801106 
Item 1:	Reporting Person - Edward C. Johnson 3d  
Item 4:	United States of America 
Item 5:	None 
Item 6:	None 
Item 7:	853,600 
Item 8:	None 
Item 9:	853,600 
Item 11:	11.60% 
Item 12:	IN  
 
 
 
Cusip # 251801106 
Item 1:	Reporting Person - Abigail P. Johnson  
Item 4:	United States of America 
Item 5:	None 
Item 6:	None 
Item 7:	853,600 
Item 8:	None 
Item 9:	853,600 
Item 11:	11.60% 
Item 12:	IN  
 
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
 
Item 1(a).	Name of Issuer: 
 
		Devon Group Incorporated 
 
Item 1(b).	Name of Issuer's Principal Executive Offices: 
 
		281 Tresser Boulevard, Suite 501 
		Stamford, CT 06901-3227 
 
Item 2(a).	Name of Person Filing:  
 
		FMR Corp. 
 
Item 2(b).	Address or Principal Business Office or, if None, Residence: 
 
		82 Devonshire Street, Boston, Massachusetts  02109 
 
Item 2(c).	Citizenship: 
 
		Not applicable 
 
Item 2(d).	Title of Class of Securities: 
 
		Common Stock 
 
Item 2(e).	CUSIP Number:   
 
		251801106 
 
Item 3.	This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) and the  
person filing, FMR Corp., is a parent holding company in accordance  
with Section 240.13d-1(b)(ii)(G).  (Note:  See Item 7). 
 
Item 4.	Ownership 
 
	(a)	Amount Beneficially Owned: 
	853,600 
 
	(b)	Percent of Class: 
	11.60% 
 
	(c)	Number of shares as to which such person has:   
 
	(i)	sole power to vote or to direct the vote: 
	None 
 
	(ii)	shared power to vote or to direct the vote: 
	None 
 
	(iii)	sole power to dispose or to direct the disposition of: 
	853,600 
 
	(iv)	shared power to dispose or to direct the disposition of: 
	None 
 
 
 
 
Item 5.	Ownership of Five Percent or Less of a Class. 
 
	Not applicable. 
 
Item 6.	Ownership of More than Five Percent on Behalf of Another Person. 
 
	Various persons have the right to receive or the power to  
direct the receipt of dividends from, or the proceeds from the  
sale of, the common stock of Devon Group Incorporated.  The  
interest of one person, Fidelity Low-Priced Stock Fund, an  
investment company registered under the Investment Company Act  
of 1940, in the common stock of Devon Group Incorporated,  
amounted to 678,600 shares or 9.22% of the total outstanding  
common stock at February 28, 1998.     
 
Item 7.	Identification and Classification of the Subsidiary Which Acquired  
the Security Being Reported on By the Parent Holding Company. 
 
	See attached Exhibit(s) A and B. 
 
Item 8.	Identification and Classification of Members of the Group. 
 
	Not applicable, see attached Exhibit A.  
 
Item 9.	Notice of Dissolution of Group. 
 
	Not applicable. 
 
Item 10.	Certification. 
 
	By signing below I certify that, to the best of my knowledge  
and belief, the securities referred to above were acquired in  
the ordinary course of business and were not acquired for the  
purpose of and do not have the effect of changing or  
influencing the control of the issuer of such securities and  
were not acquired in connection with or as a participant in any  
transaction having such purpose or effect. 
 
 
Signature 
 
	After reasonable inquiry and to the best of my knowledge and  
belief, I certify that the information set forth in this  
Schedule 13G in connection with FMR Corp.'s beneficial  
ownership of the common stock of Devon Group Incorporated at  
February 28, 1998 is true, complete and correct.  
 
 
	March 10, 1998	 
Date 
 
 
 
	/s/Eric D. Roiter 
Signature 
 
 
 
	Eric D. Roiter	 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of FMR Corp. and its direct  
and indirect 
subsidiaries 
 
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
	Pursuant to the instructions in Item 7 of Schedule 13G, Fidelity  
Management & Research Company ("Fidelity"), 82 Devonshire Street, Boston,  
Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and an investment  
adviser registered under Section 203 of the Investment Advisers Act of 1940,  
is the beneficial owner of 853,600 shares or 11.60% of the common stock  
outstanding of Devon Group Incorporated ("the Company") as a result of acting  
as investment adviser to various investment companies registered under Section  
8 of the Investment Company Act of 1940.   
 
	The ownership of one investment company, Fidelity Low-Priced Stock Fund,  
amounted to 678,600 shares or 9.22% of the common stock outstanding.  Fidelity  
Low-Priced Stock Fund has its principal business office at 82 Devonshire  
Street, Boston, Massachusetts 02109.   
 
	Edward C. Johnson 3d, FMR Corp., through its control of Fidelity, and the  
funds each has sole power to dispose of the 853,600 shares owned by the Funds. 
 
	Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has  
the sole power to vote or direct the voting of the shares owned directly by  
the Fidelity Funds, which power resides with the Funds' Boards of Trustees.   
Fidelity carries out the voting of the shares under written guidelines  
established by the Funds' Boards of Trustees. 
 
	Members of the Edward C. Johnson 3d family and trusts for their benefit  
are the predominant owners of Class B shares of common stock of FMR Corp.,  
representing approximately 49% of the voting power of FMR Corp.  Mr. Johnson  
3d owns 12.0% and Abigail Johnson owns 24.5% of the aggregate outstanding  
voting stock of FMR Corp.  Mr. Johnson 3d is Chairman of FMR Corp. and Abigail  
P. Johnson is a Director of FMR Corp.  The Johnson family group and all other  
Class B shareholders have entered into a shareholders' voting agreement under  
which all Class B shares will be voted in accordance with the majority vote of  
Class B shares.  Accordingly, through their ownership of voting common stock  
and the execution of the shareholders' voting agreement, members of the  
Johnson family may be deemed, under the Investment Company Act of 1940, to  
form a controlling group with respect to FMR Corp.   
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
RULE 13d-1(f)(1)  AGREEMENT 
 
	The undersigned persons, on March 10, 1998, agree and consent to the  
joint filing on their behalf of this Schedule 13G in connection with their  
beneficial ownership of the common stock of Devon Group Incorporated at  
February 28, 1998. 
	FMR Corp. 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of FMR Corp. and its direct  
and indirect subsidiaries 
	Edward C. Johnson 3d 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of Edward C. Johnson 3d 
	Abigail P. Johnson 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of Abigail P. Johnson 
	Fidelity Management & Research Company 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
V.P. and General Counsel 
	Fidelity Low-Priced Stock Fund 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
Secretary